the ls7 doesn't have the active fuel management like bapple said. the good fuel numder are from the light engine load/ low rpm from the 6 speeds gear box and the 3.42:1 final ratio. on the highway at around 70 mph, the engine rpm is around 2000 ;). so this why the Epa rating is 26 mpg on the Highway with the supercharger, the engine is more effiency and you even don't know that you have one under the hood while cruising on the street until you smash the go pedal !! :O

Blackvoodoo

December 22, 2008

sounds like they were having fun!

coolbreeze44

December 22, 2008

that is a badass vette but its still a ls7 427 c.i motor so comparing that to a cobra is still like comparing apples to oranges but im sure a cobra wouldn't back down from a race because the lil 4.6 still makes sum serious hp modified..