Just testing the waters here for a conversion. As of now this would be going into a rcsb 4x4. What is the best and average you are getting with maybe slight mods like mild cam and headers,tune,etc. to no mods. What engine/trans are you running and so forth.
Dont think many here keep track of that s much as others do.
With just a tune in my 5.3/4l60 and 3.73 gears in a ecsb 4x4 i get 14-16 around town. Which is 2-3 better than the tbi got. Last weekend i drove from va to pa on I-81 going 75-80 mph and got 17.2 over the whole trip. If i was driving around 65-70 mph i would hope it would rise to 18-18.5 as that is where 3.73s seem to be happiest.Originally Posted by 85 silverado
4.3 V6, average 21. 5.3 V8 with heads/cam, average 24.
2006 SilveradoLittle Black Bitch
What is it in?! And also what year 5.3?
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 06:30 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.
It's in the truck in my sig. 2005 LM7 5.3.
2006 SilveradoLittle Black Bitch
WTF my 4.8 gets 15 mpg no matter what i do.
4.8, TSP 220, 6L90 swap, 3400 Stall, 4.10s w/30" drag radial and T76 @ 16lbs.
Best ET 11.54@114 w 1.52 60ft
Raceweight 4905 lbs.
The 4.8 ia the problem.WTF my 4.8 gets 15 mpg no matter what i do.although mine gets 17 so im not sure.
Fbody headers are supposed to fit pretty good.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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