Sean, it would be awesome to shove those words down your throat and show you what that buick motor can do. When a motor is putting over 400 horses at only a little over 4600rpm and just a touch over 500 ft lbs torque @ 2900rpm, you dont work that motor nowhere near as hard as you do with todays production 5,000 rpm + motor.

BTW, a 1969 GS " the motor was donated from a wrecked gs frown " Got 14mpg with a 3 speed auto. And that was in a car that weighed over 4000lbs.