1966 Dart 225 Slant/3 spd power/MPG?

Well, I have a '65 barracuda 225/6 auto, 7 1/4 with 2.93:1 gears. I'm getting around 20 miles to the gallon. I'm driving it like a grandma being it has the holley 1 barrel. So I start out nice and slow. It has absolutely NO BALLS from dead stop to around 45 mph. I hope this helps you. I figure you;ll get better than that if ya keep your foot out of it.