Promise i'm not a liar

[DAVe3283]

I'm super jealous of you guys. Best I have ever gotten is 19.4 MPG, and that was all highway, 55-65 MPH. Fuel stats:

Does anyone elses low fuel light kick on right about the time their truck runs out of fuel? My low fuel light is a bit retarded

I used to have this happen all the time, and sometimes it would die before the light came on.

I finally got mad and pulled the sending unit, and found 2 things. One, the pickup tube was cracked so it would suck air, and two, there was a bottle cap stuck to the bottom of the pickup.

Threw a new one in and no trouble since!

 

[hotdogstand]

The best I've ever gotten is 25-point-something coming out of the mountains on the way west through WV/Kentucky. Averaged 21-ish on flat land on both sides of that, though. 1000 mile trip, probably 200+ miles between fill-ups.

 

[NC-smokinlmm]

26 gallon for 2001-2010 short bed trucks.

I think GM lied to me though. Ive run my truck out of fuel a dozen times or so and never in 240k miles put more than 23 gallons in.

Yet some people claim they have put 25-26 gallons in their 26 gallon tank...so who knows.

I put in over 24 several times in my lmm. The other day my lml took 35. I was pushing it...lol...

 

[NC-smokinlmm]

Does anyone elses low fuel light kick on right about the time their truck runs out of fuel? My low fuel light is a bit retarded

Pull your sender and clean the fuel senders board and contactor with clr. The one in my lmm would do some funky stuff untill I cleaned it...

Also retension the contactor...

 

[Lance LB7]

I get high mileage My self. The zf6 and reg cab plays a big part in it. Like the truck by btw:thumb:[/QUOTE]

Thanks man. but yeah single cabs and zf-6 helps a lot. its got manifolds and intercooler too, which probably doesn't hurt

 

[LbZzF6RCLB]

I know its hard to believe anyone on fuel mileage but these numbers are hand calculated and I wanna see if anyone else has ever seen these. filled up at home and drove to college, all highway and interstate. filled back up, 70 miles, and averaged 29.2 MPG. anyone else ever seen anything this high or is it a fluke?

I get high mileage My self. The zf6 and reg cab plays a big part in it. Like the truck by btw:thumb:

 

[MAXX IT OUT]

Does anyone elses low fuel light kick on right about the time their truck runs out of fuel? My low fuel light is a bit retarded

Mine does it to and when that happened all I put in was a little more then 24 gallons. Any of you guys run fuel sumps put a full 26 gallons in?

 

[SickLL7Crenshaw]

My grandfathers feed pickup which is a shortbed lb7 the fuel gauge doesn't work and he forgets to fill it up before leaving the ranch sometimes and I always get the call that he's ran out of fuel. I've put in 25.2 gal before in that truck. And the tank was bone dry.

 

[mike diesel]

Stock motor I averaged 13.5mpg. Built motor I average 13.5mpg. The absolute highest I have ever gotten in any of the trucks I have ever owned was my 01 24v cummins. QCSB 5 speed with an edge comp box, stock turbo and some edge jammer 5 injectors netted me 18mpg with cruise set at 71mph coming back from Vegas to salt lake.

I do not understand how people get the mileage I see so many people claim. My 12 valve got 12mpg. My 02 lb7 got 13mpg my 01 24v averaged 15mpg and my 05 lly averages 13.x in the winter and i can squeeze out about 14.5mpg in the summer.

 

[catman3126]

I had calc at one time in my LLY with efi live tuning and stock turbo going from Home to seattle and since i was on OT the whole way I set the cruise at 65 and left it alone lol. 19.1 mpg it is up and down hills my 03 6 speed ecsb zf6 I got 22.3 driving back to colorado on one tank most the time that one would get 18 empty with nothing done to it at all.

 

[WolfLMM]

26 gallon for 2001-2010 short bed trucks.

I think GM lied to me though. Ive run my truck out of fuel a dozen times or so and never in 240k miles put more than 23 gallons in.

Yet some people claim they have put 25-26 gallons in their 26 gallon tank...so who knows.

Yup, the absolute most I have ever put in was 24.00 gallons. And I basically coasted into the fuel station.

 

[jacobdewey]

Stock motor I averaged 13.5mpg. Built motor I average 13.5mpg. The absolute highest I have ever gotten in any of the trucks I have ever owned was my 01 24v cummins. QCSB 5 speed with an edge comp box, stock turbo and some edge jammer 5 injectors netted me 18mpg with cruise set at 71mph coming back from Vegas to salt lake.

I do not understand how people get the mileage I see so many people claim. My 12 valve got 12mpg. My 02 lb7 got 13mpg my 01 24v averaged 15mpg and my 05 lly averages 13.x in the winter and i can squeeze out about 14.5mpg in the summer.

The lowest I've ever got in a duramax was 13 mpg pulling my enclosed trailer from Idaho to Vegas. Used to go every winter, and mileage was always around that 13-14mpg. My rclb lb7 averages 16.5, and that's letting it warm up and idle alot. Most of my driving is 65mph or less though.

 

[OregonDMAX]

Lb7's are usually the best for mileage so take that into consideration.

I've never once put over 24 gallons in and I drove with the low fuel light on for 2 days back and forth to work :roflmao:

 

[Awenta]

Lb7's are usually the best for mileage so take that into consideration.

I've never once put over 24 gallons in and I drove with the low fuel light on for 2 days back and forth to work :roflmao:

LOL that's brave. I set my alarm at 15% and don't usually get that low. I like to fill up at a quarter.

Picked up that habit after making a quick run to get something and then realizing there isn't a gas station anywhere within half an hour.

Sent from my SM-N910V using Tapatalk

 

[Lance LB7]

The lowest I've ever got in a duramax was 13 mpg pulling my enclosed trailer from Idaho to Vegas. Used to go every winter, and mileage was always around that 13-14mpg. My rclb lb7 averages 16.5, and that's letting it warm up and idle alot. Most of my driving is 65mph or less though.

My truck at 55-60 will only get 20-22mpg. Rpm's are about 1600 at 55 and it seems like its kind of under the charger at that rpm so it has to work a little harder to maintain speed. and the pyro reflects that. at 75 you're turning 2k and the truck kind of pulls itself up hills. on the interstate pyro never gets above 800

 

[WVRigrat05]

Mine gets 11 mpg, and I've never got more than 23 gallons in mine either. JUNK.

 

[Harbin_22]

Guys that get bad mileage must have a heavy foot or shitty tuning. I just drove a built motor, 60% Inj, 72/83 compound set up, 1700miles in below zero temps from Louisville to Massachusetts and hand calculated over 19mpg between 70-80mph. I can beat the crap out of my truck, let idle a bunch and still never get worst than 13-14mpg.

 

[WVRigrat05]

Korys tunes. 35's 1200 lbs of tools/fuel in the bed and I have a 100 lb foot. I drive like a t total asshole all the time. Opt. Stock tune.

 

[Harbin_22]

Do you drive up hill all the time too :roflmao:

 

[DieselBulldog10]

I have hand calculated 28.4 MPG over the last couple tanks of fuel. I do a lot of freeway driving though so that will boost it compared to a lot of people. About 5000 miles a month.

I couldn't believe the good mileage I was getting with it. Before it was tuned and intake was cleaned and all the other goodies the best I could do was 20mpg or so.
And I thought my old 12v got good fuel mileage. I was pleasantly surprised by this.