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1990SSchevy65 · 06-13-2010, 10:29 AM

I get anywhere from 8-10 mpg out of my 1990SS and the drivetrain is stock, well minus the smog stuff. My 2003 1500HD 4x4 CCSB gets 11-12 and that's a 6.0 with a 4 speed auto. I believe both of my trucks have a 3.73 gears.

06-13-2010, 10:29 AM	#17
1990SSchevy65 Registered User Join Date: Jul 2004 Location: Houston, TX Posts: 109	Re: 88-90 454 gas mileage I get anywhere from 8-10 mpg out of my 1990SS and the drivetrain is stock, well minus the smog stuff. My 2003 1500HD 4x4 CCSB gets 11-12 and that's a 6.0 with a 4 speed auto. I believe both of my trucks have a 3.73 gears. __________________ 2003 Chevrolet CCSB 4x4 1500HD Mine 2011 Toyota Corolla S Wife's new ride 2002 Pontiac Grand Am SE2 Wrecked/Totaled 2014 1990 Chevrolet 454SS GONE 02/26/11 1991 S10 SCSB GONE 12/24/08 1965 Chevrolet LB GONE 06/06/05 GM for life