It has been a while since I drove it, but I seem to remember around 17MPG with the 302 and ~16.5 with the S/C, but I have a heavy foot, so both could have been improved upon. Also, I have 4:10 gears and my truck is a pig at 4520lbs (4x4 4-door, fiberglass top,etc).
Was it fast - yes, was it f-in fast, not really. That is why I am doing the 351W. I could have made it fast with a bypass system added to the KB to keep inlet temps down and bump timing, making custom headers for the 302, puting a decent set of heads on it, a cm, and/or spending a bit more that one stop at the dyno tune. I just deceided if I am going to spend the time/ money, I may as well jump 50 cubes while I am at it and be ready to jump another on top of that with a simple windsor stroker kit.
Biggest problem with this truck is it's weight.
DD: 2010 Sport Trac Adrenalin. 4.6L V8 / AWD with Terra Grapplers and Voxx G-FX wheels.
Toy: 1999 Ranger 4x4 4Door. Replacing 302w 1.5L Kenne Bell with a 351W: Explorer EEC-V DIS, AFR205 heads, custom 1 3/4" long tube headers and Autorotor 2.6L supercharger, intercooled with '03 Cobra and custom fabricated manifold.