8.1l Mpg

[JF1957]

I'm looking to buy a monster truck to tow my rv trailer it's a 2004 K2500 Burb with the 8.1L and I don't find the mpg average ? It may have some reason

Thanks

[Nytemare]

I'm looking to buy a monster truck to tow my rv trailer it's a 2004 K2500 Burb with the 8.1L and I don't find the mpg average ? It may have some reason

Thanks

Its because 8.1L and fuel economy don't belong in the same sentence.

 

If you want economy, get a diesel...but you'll pay a premium for that too....average as far as I have heard for the 8.1 is around 10-12MPG if the maintenance is kept up to date. You may do a little better on the highway...but with a loaded trailer....your gonna be looking in the 6-8 MPG range.

[coryjd]

You can't buy a truck and worry about MPG.

[JF1957]

You can't buy a truck and worry about MPG.

That's really true

[Stevens03]

9mpg to 13mpg if your lucky...

[springfield]

I would have to agree with everyone else. You can't buy the 8.1 with fuel economy in mind. I have only had mine for about four months and won't know about the towing fuel economy until this summer. I have seen numbers as high as 14 on the highway and 10 in town. I usually average a whopping 12.5. Fortunately it is not my daily driver. Should tow like a beast though.

[FarmerDave]

My parents drive a NBS 2500 with a 6.0L they usually average 13.5 mpg from what i have heard, expect less.......

[s-ten]

I have been around them since they came out in 2001 and I can tell you they get from 9-12 MPG. My dad's current 3500 dually does 9.5 MPG almost consistently. Towing a large slide-in camper and an 18' fishing boat it will do 9 MPG, empty might be 10.

 

I have never drove a Suburban with the 8.1/4-speed combo, but the 8.1/Allison is a very capable puller. Also a Suburban may net slightly better mileage than a 3500 dually pickup.

 

I notice that you currently have a '99 C2500 Suburban, if you have the 454 in that then the mileage will be the same or better with the 8.1.

[JF1957]

I notice that you currently have a '99 C2500 Suburban, if you have the 454 in that then the mileage will be the same or better with the 8.1.

 

 

Are you serious....

[s-ten]

I notice that you currently have a '99 C2500 Suburban, if you have the 454 in that then the mileage will be the same or better with the 8.1.

 

 

Are you serious....

 

I am just going by what I have experienced, the last 454 that we had was a 2000 that would average 8-9 unloaded, that is it. When it was loaded it was plain awful. I guess that was a generalization about the Vortec 454, I should have said that the 8.1 should be better than the old 454. If you have a 350 in the '99, then the 8.1 will most likely be worse.

[Savagecanuck1]

I had an 01 with the 8.1 and Alison and it was a great truck,felt like a sports car with that big motor.Back then fuel was about 40% cheaper and I could afford to drive it.It also hauled my travel trailer effortlessly.But in todays world of ever higher fuel prices I drive a 1500 with the 5.3 AFM

[yukon25008.1]

my 04 yukon 2500 has an 8.1 and im generally 9-10 mpg

[Big black truck]

The highest I got empty was 13.6 hwy and 9.5 city. Towing I get 9. I have not run a full tank with my new tune, but so far it looks like it's going to help a bit.

[braxx]

I would have to agree with everyone else. You can't buy the 8.1 with fuel economy in mind. I have only had mine for about four months and won't know about the towing fuel economy until this summer. I have seen numbers as high as 14 on the highway and 10 in town. I usually average a whopping 12.5. Fortunately it is not my daily driver. Should tow like a beast though.

 

This is pretty musch spot on for my 2002 Silerado 2500HD, 8.1L / allison, crew cab, 4x4, with 3.73 grears.

As a matter of fact I just checked my MPG this morning and I averaged 9.997 MPG this past week with 80-90% of the miles being driven in town.

I manually compute my MPG when I fill up AND I also have a SCANGAUGE2 that I compare it too.

I plan on buying a Black Bear tune and seeing just how much more MPG I can get out of this truck.

[jro909]

don't even try to figure out the average mpg, thats how people get depressed...just think of the good things, its going to Mooove, whats the specs on that motor?