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.
Last edited by 00shortbox; 07-26-2012 at 07:30 PM.
2000 Chevy Silverado RCSB LS6 5 speed, LS6 short block, 317 heads, LS6 intake, Lunati 220/224 .575/.575 112LSA cam, Edelbrock Headers, CTS-V accessory drive, Nelson Performance Custom Tune.
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