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kevinr1970 · 01-20-2007, 03:41 PM

1998 Chevy 2500 Crew swb 4x4, 5.7 Vortec, auto.
Best I ever got was 15.2. Thats going across the state going about 75mph with the cruise on. Crossing a pass with some pretty good hills the first half the drive.
I have read the TBI 5.7's are good for 190 or 210hp depending on model. The Vortecs are good for 255 no matter what. Not 100% but pretty sure this is accurate.

01-20-2007, 03:41 PM	#5
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Re: How Many MPG does your Vortec get? 1998 Chevy 2500 Crew swb 4x4, 5.7 Vortec, auto. Best I ever got was 15.2. Thats going across the state going about 75mph with the cruise on. Crossing a pass with some pretty good hills the first half the drive. I have read the TBI 5.7's are good for 190 or 210hp depending on model. The Vortecs are good for 255 no matter what. Not 100% but pretty sure this is accurate. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)