Well, I drove the Iroc R/T to Muncie, Ind. last weekend and got 29.87 MPG. Ran A/C most of the way and had the curise set at 72 mph. 308.5 miles on 10.328 gal. of Sunoco 94. This included about 40 miles of running around at the destination and a couple relatives wanted a Spirited ride into the triple digits. I was hoping for 24/25 mpg. The R/T is basically stock except for the Titanium Valve Spring Retainers. Still running the original exhaust. I haven't filled up since I go home to figure the milage on the return trip.