Anyone done this? I drive my car everyday, I am not sure if I want to put them on or not. Anyone have any input, will it affect gas mileage or driveability. I get about 22mpg average. My car runs perfect as of right now. I have this urge to run 12s in my daily driver I think with headers, 1.6rr, lower control arms and turning, I might nick 12s. If not I can always throw some 3:73s in, I'm running on 2:73s now.

 

I have the Crane Gold's on my DD....Granted it doesn't get over 200 miles a week, but I drive it everyday..

 

I have the LT4 full rollers on my DD. I put that and new pushrods on when we did some other things on the way to a cam/spring swap. Have not noticed a real mileage change either way since the header/RR and tune. Still 16 in town and 21 on the highway, just what the window sticker says.

 

I get around 15-16 mpg city and 20 mpg highway. I have a big cam and 1.6 RRs.