what kind of fuel mileage are you getting?

[badfarmtruck]

trying to decide between an ls swap and building a healthy big block

so basicly whats your combo and whats your mpg any input will be appreicated

thanks
Brian

[farmtrucks]

5.3 (with hp tuners tune), 4l60e, 373 gear 265/70/15 tire -- got 24 mpg going to Nashville Goodguys about 1 month ago
On same trip my brother with a '66 truck with 4.8 (with hp tuner) 4l60e, 373 gear, 255/70/15 got 23mpg

[74project]

Drive everyday and it has not been tuned on a dyno or hand held and it runs rich but im getting around 16 to 19 mpg....the power is out of control..
Posted via Mobile Device

[mrhurt73]

Originally Posted by farmtrucks

5.3 (with hp tuners tune), 4l60e, 373 gear 265/70/15 tire -- got 24 mpg going to Nashville Goodguys about 1 month ago
On same trip my brother with a '66 truck with 4.8 (with hp tuner) 4l60e, 373 gear, 255/70/15 got 23mpg

wow, how about sharing that tune? sounds like that one works pretty good.

[badfarmtruck]

5.3 or 6.0

[Dustytrix]

5.3 4l60e, 342 gears. I am getting 18.5 city. And thats with 87 octane, 10% ethanol.

[TR65]

6.0 LS2 (SSR) T56 3.73. Honest 17 mpg over the last year driving back and forth to work (I check every tank). I was expecting 20 but I think aero is really bad.

TR

[ls1nova71]

http://67-72chevytrucks.com/vboard/s...d.php?t=510395
Posted via Mobile Device

[Mr. 250r]

what about a healthy ls big block 8.1 anyone? no mpgs but good power

[nacho55]

I had a loaded 01 extended cab dually 4x4w/ the 8.1 and it ran great pulled great and would get 12-14 depending on how I drove. But for My swap is in a 55 first series 5.3 w/ a 5speed and 3:42 gears gets , 14ish, but I hot rod it around, its hard not to the thing runs like a scalded dog.. I couldn't have gotten the machine work done on a motor for what I have in my swap.
Posted via Mobile Device

[BR3W CITY]

cammed 6L, 4l80e 12bolt and heavy 15x12 beadlocks and MT Streets. I average like 14ish, but we are having issues with overdrive and lockup. Once fixed, I should get around like 17-19

[rs72z]

5.3 4l60e in a crew cab dually running 4.10 and a 235-75-16's has got a best so far of 18. It hasnt been on a dyno, i don't know if it will help or not.

[Shon]

6.0/4L80e 15MPGs no matter how its driven.
I have not checked mileage pulling the car/trailer but I know its prob around 10ish, I have some tuning to do with the heavier load, I can hear it pinging, doesnt do that without load.
I have a small cam to help with the TQ down low and hoping that will help unloaded MPGs too.

[awhite4557]

I have a 71 chevy C-10 with 5.3 / 4L60E. I drove to Goodguys in Ft. Worth from Odessa and averaged 22mpg without the A/C and 18.9 with the A/C.

[vannatta20]

19mpg with stock 5.3 and 4l60E , 68 longbed