Why do Cobras get low MPG?

Discussion in 'SVT Tech Forum' started by rdefino, Jul 5, 2004.

  1. the Z06 has a .56 6th gear. The standard C5 and Fbods have a .50 I believe.

    I got around 29mpg on the freeway bonestock, a/f around 11.9/1. After a .591 lift cam and getting it tuned to a 13/1 a/F, I am getting 34mpg cruising 68, no a/c. Thats with a stock 3.42 rear.

    With the 3.90s, it's dropped back down to like 28mpg. I'm kind of surprised going from 3.42s to 3.90s made that dramatic of a difference on the freeway, but it has. City is about the same as before (17mpg).