What kind of mileage are you getting with your conversions.

[Clayman]

4.3 V6, average 21. 5.3 V8 with heads/cam, average 24.

What is it in?! And also what year 5.3?

[00shortbox]

Used to have a 4.3L 5 speed 2wd and averaged 20-21, now have a 5.7 LS6 with the mods in my sig, haven't calculated it since my speedo is way off, but its a lot better than the 4.3 especially on the highway, I'd estimate I'm getting anywhere between 24 and 27mpg with the LS6, not driving the piss out of it. At 85mph it's basically the weight of my foot on the pedal pressing 1/16"on the gas pedal instead of between 1/4 and 1/2 throttle with the V6.

[RS/SS 4.8]

Used to have a 4.3L 5 speed 2wd and averaged 20-21, now have a 5.7 LS6 with the mods in my sig, haven't calculated it since my speedo is way off, but its a lot better than the 4.3 especially on the highway, I'd estimate I'm getting anywhere between 24 and 27mpg with the LS6, not driving the piss out of it. At 85mph it's basically the weight of my foot on the pedal pressing 1/16"on the gas pedal instead of between 1/4 and 1/2 throttle with the V6.

WTF my 4.8 gets 15 mpg no matter what i do.

[kerrige]

WTF my 4.8 gets 15 mpg no matter what i do.

The 4.8 ia the problem. although mine gets 17 so im not sure.

[Frenchy]

What is it in?! And also what year 5.3?

It's in the truck in my sig. 2005 LM7 5.3.