REAL World MPG's

Awenta

Active member
Sep 28, 2014
4,090
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CT
2007 new body style 6.0 and forward have the 6 speed not the classic. That is the truck I'm referring to. I had 35" tires on my 07 for a test run on mileage before I bought the 2015 from midstate sc to the business section of savannah thru all the lights and drive thru back to midstate sc 246.17 miles burning 17.52 gallons at top off and tracked it with 2 gps devices because the speedo was off from no recalibration. The 14.5 I spoke off was a constant for 2 years of using it loaded down with tools going to jobsites

Doesn't matter what you're driving. It's always loaded down with a tool. A big one holding the steering wheel.

Sent from my SM-N910V using Tapatalk
 

Hot COCOAL

May the farce be with you
Jun 9, 2012
4,433
0
0
If
The base engine is the Vortec 6000, a 6.0-liter V8 (366 cubic inches) that generates 300 horsepower and 360 foot-pounds of torque at 4000 rpm. Introduced for 1999, it's designed for a 200,000-mile operating life with 10,000-mile oil change intervals. Its aluminum cylinder head is similar to that of the L56 Corvette. That's from way back in 2002. So what you're telling me is increasing fuel pressure to extreme heights causing excessive cylinder heat , blowing head gaskets and changing shift firmness to jerking points causing excessive wear and instability on how the internals are applied doesn't mean a thing. Well I guess you got me. I must don't know a thing about mechanical principles. Tell me does Viagra make you feel like a real man
Thanks for the inaccurate history lesson...
The LQ4 wasnt designed for 10,000mi OCI
The vettes in 02 were the C5 and had an LS1 5.7L engine
The Head on the LQ4 was changed in 01 from its original offering in 99, and the new version was the aluminum head with the casting # of 317, and if anything is closer to an LS6 head, oh, and the LQ9 casting # of 035...

And yes, WE!
Not just me, but the collective whole here on this forum are telling you that you can attain roughly 550whp out of a factory built Duramax longblock, add some head studs and a built transmission and good tuning and it will live a very long service life....

So yeah, you dont know anything about these trucks, you should really just shut up and read for a couple weeks cuz the only thing you're "proving" to anyone here is, you're a keystroke happy moron, which at this point i think is a blatant liar too, not just because of the 6.0L claimed fuel economy on 35 i tires hauling tools, but for the fact you claimed to have built race engines all the way up to "top fuel" or whatever, and dont seem to know shit about the most acclaimed series of engines to ever be introduced to the hotrodding scene...the gen3 and gen5 LS engines...


And the last comment...
pshh
Dude, you need to chiggity check yo self b4 you wreck yo self

Does making ridiculous comments like that make you feel like a man?
Does your keybaord ninja suit come with a mask? I bet it does and youve got it on
:)

2007 new body style 6.0 and forward have the 6 speed not the classic. That is the truck I'm referring to. I had 35" tires on my 07 for a test run on mileage before I bought the 2015 from midstate sc to the business section of savannah thru all the lights and drive thru back to midstate sc 246.17 miles burning 17.52 gallons at top off and tracked it with 2 gps devices because the speedo was off from no recalibration. The 14.5 I spoke off was a constant for 2 years of using it loaded down with tools going to jobsites
Lol, ok
Oddly enough
IIRC, the 6L80 6sp (rpo myc) actually doesnt allow for as much towing capacity as the 4L80, a split gear version of the 4L80 it wasnt a "true" 6sp...the 6L90 on the other hand...now that is a true HD 6sp

AND
Wow...just for the record, what youre telling us here
Thats Not Impressive, not at all broski
Lol

Why dont you go butcher facts and talk out your ass somewhere else, seriously homie, although, this is kinda fun
 
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fast03

Active member
Jun 15, 2008
1,201
6
38
60
Rancho Cucamonga
This is some funny chit... I used to get 10 towing with the lb7 and I get 10.5 towing with the LML. I got a pretty heavy foot tho. My buddy with a 2006 6.0 gets 7 towing a lighter load. Also note we put a torque converter in that truck last year. right at 100k miles.
 

boss_hog

New member
Jan 19, 2015
22
0
0
South Carolina
2015 Ike Gauntlet 2500 hd with 6.0 with 12000# trailer and 3000 payload. 7% incline 8 mile stretch wide open throttle the entire distance ended the pull in 10:38 at lower 42 miles an hour at mid 2 mpg for the run.
The same exact load on a 2015 3500hd with duramax ended 7:52 @55 mph and mid to high 4 mpg for the pull. That's the limits on what they can do. Yep the duramax won in time and mileage. At the same time there isn't many people that pull that kind load in that grade most of the time they drive a truck but they both made it fine. The new Ram hemi on the other hand went all the way down to first gear and 29mph. That won't last. My point being the 6.0 is very capable and isn't a dog. For the average driver the diesel isn't worth the extra money and won't recoup it by mileage gains with the ongoing price difference of fuel. Most people trade in before 100k and hardly anyone keeps a new vehicle past 200k. Of course the value at resale or trade is greater but hardly ever more than the original premium paid. If you're pulling much heavier loads often then a dually is really more your needs especially for safety. You can trick anything out for short runs even gas with 500hp shots of nitrous but any of that increases wear and cost $ if you don't see that you are foolish. Whether are not you believe gm designs the 6.0 for 200000 miles doesn't matter because they do. I can't wait till the grave digger gets some oil http://m.youtube.com/watch?v=YQ8fn3PvNhQ
http://m.youtube.com/watch?v=UuRg8ZkrxKM
 

Hot COCOAL

May the farce be with you
Jun 9, 2012
4,433
0
0
2015 Ike Gauntlet 2500 hd with 6.0 with 12000# trailer and 3000 payload. 7% incline 8 mile stretch wide open throttle the entire distance ended the pull in 10:38 at lower 42 miles an hour at mid 2 mpg for the run.
The same exact load on a 2015 3500hd with duramax ended 7:52 @55 mph and mid to high 4 mpg for the pull. That's the limits on what they can do. Yep the duramax won in time and mileage. At the same time there isn't many people that pull that kind load in that grade most of the time they drive a truck but they both made it fine. The new Ram hemi on the other hand went all the way down to first gear and 29mph. That won't last. My point being the 6.0 is very capable and isn't a dog. For the average driver the diesel isn't worth the extra money and won't recoup it by mileage gains with the ongoing price difference of fuel. Most people trade in before 100k and hardly anyone keeps a new vehicle past 200k. Of course the value at resale or trade is greater but hardly ever more than the original premium paid. If you're pulling much heavier loads often then a dually is really more your needs especially for safety. You can trick anything out for short runs even gas with 500hp shots of nitrous but any of that increases wear and cost $ if you don't see that you are foolish. Whether are not you believe gm designs the 6.0 for 200000 miles doesn't matter because they do. I can't wait till the grave digger gets some oil http://m.youtube.com/watch?v=YQ8fn3PvNhQ
http://m.youtube.com/watch?v=UuRg8ZkrxKM

Sincerely,
This is your best post thusfar...

But food for thought here...
If you drive allot like I do, the cost difference quickly becomes a wash...relitively speaking...

Simple math on the fuel alone in my experience with both rigs...
I was paying $800 a month in fuel cost (and sometimes more) to drive my gasser 3/4ton truck around...

The same driving (probably allot worse, lol) in the Duramax and the same milage costs me about $550-600

So over the course of a year, im saving roughly $2000-$2500 in fuel cost alone. And, i actually pay less to insure the Duramax! So that means in the almost 4yrs I've owned this truck I have more than recovered the initial cost between buying the two when looking at used vehicle pricing
;)

Oil change intervals CAN be strewn out to 10,000mi with a Dmax (although i only go 7,500max, but with my 6.0 it never went a mile past 3k), so i actually save a bit in oil costs, especially since i was using synthetic only in the gasser and i use dino oil for the Dmax...the 4L80 required 60k service, the alli is 100k....but this debate has been had many many many times and it boils down to if you need or want a Duramax.

Theres pros and cons to owning both, but i will say this
No way no how can you get the same bang for the buck out of a gasser that you can with a duramax when it comes to a performance street truck...a tune and a trans will get you +230whp with a duramax diesel...just try and match that with a gasser

I can tell you from experience its just not possible to do for the same amount of cash, i played around with my LQ4 and I'm building an LS2 powered gasser right now...
 
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LWATSON

future trans limpers
Jul 30, 2008
2,587
1
36
55
Scotland Neck NC
CoCo, don't try to justify owning a Dmax. 95% of the members here don't need one including myself. I wanted one and I bought it. I didn't need to get married either but I like playing with girls.
 

NC-smokinlmm

<<<Future tuna killer
May 29, 2011
5,201
363
83
At Da Beach
I went thru 4 rebuilt 4l90ehd's and 2 transfer cases in my denali quadrasteer before I gave up and it was barely over 400 crank hp and it had less than 54k on the clock. Yea, I agree the 6.0 is tuff but the lack of tq and the crappy trans makes it no match for the dmax. Like I said mine got a solid 4.4 pulling my 26' cc at 75mph, every dmax I've had got at least 11.6, but who cares about 7 more mpgs on a 1200 mile drive right???

FYI, my lifted 15 lml gets 13.9 on 35's pulling the same rigg at 70. It gets a solid 20+ at 75 with 3 people luggage and a baby...
 

boss_hog

New member
Jan 19, 2015
22
0
0
South Carolina
Just spoke with my cousin with a 2012 cc/sb that just got back from key west towing his 23' hydra sports cc @ 75 mph the entire trip . It 741 miles down he filled up halfway and was empty when he got there. It came out to 10.9 mpg. I pulled a 23' Mako with my 07 6.0 about 250 miles 4 times @70 mph I got 8.6 everytime except once when I helped some people stuck on the beach. That makes the duramax 21.10% more efficient on close to the same load ( mine might have been a little heavier). Same speed same grade. The current price for gas and diesel here now is $1.79 gas $2.89 diesel. So if you do effective math diesel cost 38.10% more per gallon. So in all reality my truck effectively pulls the same load 17% more efficiently. So it costs him 17% more not less. Now if your area has the prices that can close that 38.10% difference to 21.10% then it will only be a wash. Maintenance aside but most including the 07 only requires oil changes every 7000 miles but that's another story. In your case to burn $800 in gas that means you burn 447 gallons of gas and with the price. Difference of 38.10% that means you're diesel would have to get 57.45% better mileage. Figuratively speaking 12 mpg vs 28.19 mpg. That's what I would call a lie
 
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A. Stock Lbz

New member
Aug 13, 2013
342
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0
spokane wa
Just spoke with my cousin with a 2012 cc/sb that just got back from key west towing his 23' hydra sports cc @ 75 mph the entire trip . It 741 miles down he filled up halfway and was empty when he got there. It came out to 10.9 mpg. I pulled a 23' Mako with my 07 6.0 about 250 miles 4 times @70 mph I got 8.6 everytime except once when I helped some people stuck on the beach. That makes the duramax 21.10% more efficient on close to the same load ( mine might have been a little heavier). Same speed same grade. The current price for gas and diesel here now is $1.79 gas $2.89 diesel. So if you do effective math diesel cost 38.10% more per gallon. So in all reality my truck effectively pulls the same load 17% more efficiently. So it costs him 17% more not less. Now if your area has the prices that can close that 38% difference then it will only be a wash. Maintenance aside but most including the 07 only requires oil changes every 7000 miles but that's another story. In your case to burn $800 in gas that means you burn 447 gallons of gas and with the price. Difference of 38.10% that means you're diesel would have to get 57.45% better mileage. Figuratively speaking 12 mpg vs 28.19 mpg. That's what I would call a lie

why dont you go to performancetrucks.com and jerk yourself off about your 6.0. this is a diesel site and i dont think anyone cares about justifying there diesels and if we really need them or not. stfu!
 

NC-smokinlmm

<<<Future tuna killer
May 29, 2011
5,201
363
83
At Da Beach
Just spoke with my cousin with a 2012 cc/sb that just got back from key west towing his 23' hydra sports cc @ 75 mph the entire trip . It 741 miles down he filled up halfway and was empty when he got there. It came out to 10.9 mpg. I pulled a 23' Mako with my 07 6.0 about 250 miles 4 times @70 mph I got 8.6 everytime except once when I helped some people stuck on the beach. That makes the duramax 21.10% more efficient on close to the same load ( mine might have been a little heavier). Same speed same grade. The current price for gas and diesel here now is $1.79 gas $2.89 diesel. So if you do effective math diesel cost 38.10% more per gallon. So in all reality my truck effectively pulls the same load 17% more efficiently. So it costs him 17% more not less. Now if your area has the prices that can close that 38% difference then it will only be a wash. Maintenance aside but most including the 07 only requires oil changes every 7000 miles but that's another story. In your case to burn $800 in gas that means you burn 447 gallons of gas and with the price. Difference of 38.10% that means you're diesel would have to get 57.45% better mileage. Figuratively speaking 12 mpg vs 28.19 mpg. That's what I would call a lie

Well, lets see. My Denali had 4.10's in it to make up for the lack of low end torque from the 6.0 and was awd so whats say you again??? Lol...

Give it up man, your not going to convience anyone on here of your absurd ideas of how diesels are a waste of money...:confused: Yes, I agree some that drive them do not require the power but some like to have more than they need. I apprently fit into that group...:happy2:
 

lts1ow

Needs moar PAH!
May 14, 2012
1,598
0
36
NJ
Sincerely,

Theres pros and cons to owning both, but i will say this
No way no how can you get the same bang for the buck out of a gasser that you can with a duramax when it comes to a performance street truck...a tune and a trans will get you +230whp with a duramax diesel...just try and match that with a gasser

I can tell you from experience its just not possible to do for the same amount of cash, i played around with my LQ4 and I'm building an LS2 powered gasser right now...

Uhhh, gonna have to disagree, IF we are talking strict race/fast DD truck status now. You can have a built 6.0, with a S480 on it, some 80# sticks, E85 tuned and a built 80e for much much less than a built dmax/alli.

And when/if you blow the 6.0, you can grab a junkyard 5.3/4.8 and slap it in for dirt cheap.

In that aspect the cost is leaning towards gasser being cheaper, I mean hell, I made ~700hp with my gas guzzler for well less than 8k...
 

boss_hog

New member
Jan 19, 2015
22
0
0
South Carolina
CoCo, don't try to justify owning a Dmax. 95% of the members here don't need one including myself. I wanted one and I bought it. I didn't need to get married either but I like playing with girls.

Yep buy it if you want it but telling someone to get one for better mileage doesn't mean anything unless diesel is the same price as gas or you tow up mountains all day with the rated weight
 

LBZ

Super Moderator
Staff member
Jul 2, 2007
9,903
149
63
46
B.C.
Try it at 75 mph like your cousin did and maybe your results would be a little more accurate. 5mph can be a huge difference in fuel economy. Especially with a gasser.

BTW, nobody here really gives a shit about what a 6 liter gasser gets for fuel economy. Not cause we don't want to hear it, but because it's a DIESEL site and we don't care.

We all know which one will still be running at 300 000 miles with the least amount of repairs. Hint: It WON'T be your gasser!

Again. Stop stirring the pot in a several years old thread.
 

boss_hog

New member
Jan 19, 2015
22
0
0
South Carolina
I went thru 4 rebuilt 4l90ehd's and 2 transfer cases in my denali quadrasteer before I gave up and it was barely over 400 crank hp and it had less than 54k on the clock. Yea, I agree the 6.0 is tuff but the lack of tq and the crappy trans makes it no match for the dmax. Like I said mine got a solid 4.4 pulling my 26' cc at 75mph, every dmax I've had got at least 11.6, but who cares about 7 more mpgs on a 1200 mile drive right???

FYI, my lifted 15 lml gets 13.9 on 35's pulling the same rigg at 70. It gets a solid 20+ at 75 with 3 people luggage and a baby...
My cousin spent $390 on fuel when I would have spent $329 . I'd say your speedo is calibrated incorrectly
 
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boss_hog

New member
Jan 19, 2015
22
0
0
South Carolina
Try it at 75 mph like your cousin did and maybe your results would be a little more accurate. 5mph can be a huge difference in fuel economy. Especially with a gasser.

BTW, nobody here really gives a shit about what a 6 liter gasser gets for fuel economy. Not cause we don't want to hear it, but because it's a DIESEL site and we don't care.

We all know which one will still be running at 300 000 miles with the least amount of repairs. Hint: It WON'T be your gasser!

Again. Stop stirring the pot in a several years old thread.
Obviously you didn't read the amount of miles we have on our service trucks. I'm contributing to the thread with real world mpg of various duramax models as well as Rams and 6.0s. I would for Fords if I had some but I don't