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With my old 93 Z28 Indy Pace Car which was an A4 with 3.23 gears, got 26-28 mpg on the highway and averaged 17.5 mpg over the 45K miles that I put on it. That was with the Powerdyne supercharger, SVO 24 lb injectors, SLP chip, Borla y-pipe and Flowmaster cat-back. Most of my driving is around town where I'm lucky to even get up to 45 mph so averaging 17.5 was pretty good.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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