01Z0H6

iTrader: (63)

Try changing plugs,fuel filter,air filter(or clean your K&N).. See what happens then.

I am running a Vig 3600 stallwith bolt ons a decent sized cam (G5X3) and LS6 heads.

I am easily getting 20mpg on the hwy @ 275-300 miles on a tank of fuel!

Also, a tune would be nice. You should Not be getting that kind of mileage with your mod's..

Good luck.