2017 Duramax

[Digmax]

Has it increased with mileage on the truck?
I'm just about to roll over 10k
Just filled up my 4th tank full of Def so I'm averaging 2500-3000 miles a tank
All towing though

I just towed a big cargo trailer out to west coast running 75 I averaged 8.2 mpg. Used 10 gal def in 2600 miles loaded. Coming back empty used 5 gal of Def and averaged 19 mpg hand calculated. L5p ccsb 33/12.50r20 ridge grapplers. 3.73 gears.

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[M.A.M.]

What about DEF usage?

I'll get about 2-2500 miles/7 gallons... The def usage is definitely up from the LMLs...

Has it increased with mileage on the truck?
I'm just about to roll over 10k
Just filled up my 4th tank full of Def so I'm averaging 2500-3000 miles a tank
All towing though

Maybe 1 mpg at the most...

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[RPM Motorsports]

I've got 7k mi on the truck now. I've added 4.5gal DEF since new and was full, and just got the "1k mi low" message today. Been running it long after it tells me I'm out, and fill it up right before the miles count down to "reduced power":roflmao:. They actually give you a bunch of time running it dry

 

[blackLTZ]

That's almost the same as my lml I get 12.5-13 mpg on the city and 18 highway with a 6.5 inch lift

 

[Pete246]

You guys know of anyone who took their factory air box out? I'm looking for one for my 6.0L gas hood swap. I'm thinking the l5p air box will fit into the location on my 2017 gmc all terrain hd
Even the part number for it would be great.

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[Cornell]

22k miles on mine now. Still love the truck, DEF usage is definitely going down.

 

[NinjaMax]

Just turned 29k miles, so far so good. Still does some weird stuff shifting sometimes but pretty rare. GM is constantly sending me notifications for updates..mostly exhaust related. One last month for a "seat torsion bar" not sure what that even is, Def use seems to be going down. All in all im happy with it.

 

[Rivera.alan]

Anyone know what the biggest size tires I can fit on 20x10 wheels with a stage 3 cognito leveling kit on my 2017 L5P without major trimming?
Thanks in advance and I apologize if I posted this on the wrong thread.

 

[clrussell]

Anyone know what the biggest size tires I can fit on 20x10 wheels with a stage 3 cognito leveling kit on my 2017 L5P without major trimming?
Thanks in advance and I apologize if I posted this on the wrong thread.

Well I’ve done 35s on multiple leveled 15+ trucks.

 

[Rivera.alan]

Nice! Any idea what offset your wheels were?

 

[beach_33]

Probably gonna be in the negatives. I ordered a zero offset for my 33’s and they called me and advised I go with -22 to keep from rubbing. But this is with out a leveling kit. Just have the tears raised about half an inch

 

[Rivera.alan]

Probably gonna be in the negatives. I ordered a zero offset for my 33’s and they called me and advised I go with -22 to keep from rubbing. But this is with out a leveling kit. Just have the tears raised about half an inch

sweet. Thank you for the info

I ordered 20x10 -24 offset

 

[JoshH]

The more negative the offset of a wheel, the more it will push it out and into the body when turning. If someone told you to run more negative for clearance, they are confused or aren't talking about rubbing a fender or bumper. Negative offsets are better for clearing frame and suspension parts, but that isn't really much of a problem on a truck that isn't lifted.

 

[beach_33]

Damn I didn’t get back online and edit my post. I have a horrible memory and got it backwards as far as negative and positive offset. Isn’t stock like +44 or something like that?

The more negative the offset of a wheel, the more it will push it out and into the body when turning. If someone told you to run more negative for clearance, they are confused or aren't talking about rubbing a fender or bumper. Negative offsets are better for clearing frame and suspension parts, but that isn't really much of a problem on a truck that isn't lifted.

 

[beach_33]

I apologize for getting it backwards

sweet. Thank you for the info

I ordered 20x10 -24 offset

 

[Rivera.alan]

Anyone see any issues running a 20x10 -24 offset on a stage 3 cognito leveling kit?
possibly a 34/35 inch tire.

 

[dmax_ty]

You’ll be cranked to the moon to clear them.

 

[Rivera.alan]

You’ll be cranked to the moon to clear them.

Damn, even if I run a 33?

 

[rmallen30]

I have 22x10 -25 on mine with small leveling kit, new keys , upper ca and diff drop and I still rub a good bit nothing terrible but it does rub pretty decent, I just trimmed the lower valance and trim some of the metal piece under the chrome bumper

 

[Rivera.alan]

I have 22x10 -25 on mine with small leveling kit, new keys , upper ca and diff drop and I still rub a good bit nothing terrible but it does rub pretty decent, I just trimmed the lower valance and trim some of the metal piece under the chrome bumper

Nice looking truck! Do you have any other pictures of it?
Thanks for the info!