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clinebarger · 01-03-2012, 10:37 PM

My 85 5.3L 3/4 ton Suburban gets 17-19MPG, My 04 5.3L 1/2 ton Crew gets 13-17MPG. The Suburban has a tune & will out-run my Crew & gets better mileage....Same Engine/Trans/Gears & similar weight & tire height, The tune makes alot of difference.

I have got mid twenties out of a 00 Pontiac Trans Am LS1/M6 stock with a good tune. I highly doubt you can get that with square body brick.

01-03-2012, 10:37 PM	#33
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: LT1 vs. Vortec vs. LSx My 85 5.3L 3/4 ton Suburban gets 17-19MPG, My 04 5.3L 1/2 ton Crew gets 13-17MPG. The Suburban has a tune & will out-run my Crew & gets better mileage....Same Engine/Trans/Gears & similar weight & tire height, The tune makes alot of difference. I have got mid twenties out of a 00 Pontiac Trans Am LS1/M6 stock with a good tune. I highly doubt you can get that with square body brick.