I took a solid, 1 hour drive a few weeks ago. AC was on, 6th gear with 3.73s, 70 mph, fresh MPG reset as I got on the freeway. I'm using a 93 race tune from Bama. The engine was turning 2,250....and I only got 22 MPG!!
My 07 GT had 3.55s and I could pull 30mpg at the same rpm over the course...