Griswald707
Junior Member
I have a 08 Bullitt with 4.10 gears and a M90 roush supercharger with the 257 pulley, (8 pounds Boost) and I get 18.5 mpg on the highway! Normal driving of course! Oh also im running 2450 rpms @ 70 mph FYI. also, my first post, how did I do? Will add pic of my car soon, when I figure out what im doing!