Driver for mileage

MVRCorp said
It's do-able. Mine's a 273, 30 over with 10 to 1's and a mild Isky cam. 3 on the tree. 21 MPG highway.

Longgone said
I`m doing my 67 Barracuda convertible with a low performance 273, hoping for 20mpg highway???

FWIW, on a recent trip in my 64 Barracuda with a stock Commando 273 and stock drivetrain and automatic, I got 17mpg. And that was on secondary roads. I think it might do better if I was just on the highway. Just gotta keep those secondaries closed!