What is your fuel mileage???

[Blackdog3]

My truck was getting about 8 when it had the worn out 350 with 400 trans 4.11 gears. I believe it now gets around 14 or 15 with the cummins and the 400 trans. I am losing a bit of mileage in there because it shifts into third really fast and tops out at 65 mph...

 

[oneluckypops]

My truck was getting about 8 when it had the worn out 350 with 400 trans 4.11 gears. I believe it now gets around 14 or 15 with the cummins and the 400 trans. I am losing a bit of mileage in there because it shifts into third really fast and tops out at 65 mph...

what gears are you running now? With your set up I would think you would do better with 3.73's or even 3.55's That should get your mileage up to around 20-22 MPG

 

[sean1960]

I get about 6 or 7 MPG and thats why I don't drive it everyday.

 

[Christian Nelson]

Just thought this might be a neat idea, and possably away for others to share there tricks for obtaining the fuel mileage they get out of there trucks.

Post your results as often as you can.

FYI For those of you that are not aware checking and keeping track of your MPG is also a way of determining upcoming problems.

Just checked mine when i went down south and picked the 85 parts truck up, Terrain was slightly hilly down south, i was able to get almost 15MPG going down with an empty 18' trailer, Coming back I was able to get a steady 13MPG loaded with the 85 K20 on the trailer.


Also just went to KCI airport last night to pick my parents up. Running 70-75mph with a head wind i got 14.86MPG. I topped the tank off on the way home and then again when I got back to sedalia. It checked out at 16.66 mpg again at 70 MPH.

So far I am pleased

So, What's your engine/tranny/gear ratios/tire size? You seem to be getting on the high end of what most get, let's hear what your secret is!!!

 

[oneluckypops]

So, What's your engine/tranny/gear ratios/tire size? You seem to be getting on the high end of what most get, let's hear what your secret is!!!

Engine: 5.7 Vortec fuel injected

Trans: 4L80E

Gears: 4.10's

Tires: 285 75 16 cooper discoveres

 

[jake wells]

sorry oneluckypops my internet has been done for a few days but here are the photos of the 75 Chevy c30 with the 10ft flatbed .
sorry about the junk in the bed i have been hauling junk when i got it.
this is when i first got the truck.

 

[oneluckypops]

not a bad looking truck at all, I wasnt aware that your truck was a 10' flatbed, but honestly i dont hink it weighs 9500 pounds, i would guess more along the lines of around 6500-7000

 

[78 K-10]

semi fresh 350- rochester quadrajet- mild cam- super fresh thm350 with 400tc- 12 bolt rear with 3.73- 33x12.5 tires

17.8 mpg driving 60 and round 13 round town with lots of hills

 

[Camo]

not a bad looking truck at all, I wasnt aware that your truck was a 10' flatbed, but honestly i dont hink it weighs 9500 pounds, i would guess more along the lines of around 6500-7000

I would agree.

My old crew got 8. period.

 

[heavyleft]

350 TBI, beefed up 700r4, 4.56 gears, 37x12.5's and I get around 12-13 mpg's in town.

My biggest secret is keeping my heavy right foot out of the skinny pedal.