Anyone have any suggestions for improving gas mileage on an old 302? I'm thinking all the run of the mill stuff like upgrade the air filter, better flow through the exhaust, tune up with top notch plugs and wires. Then, of course, check all the normal stuff like tire pressure and whatever. Run a carb cleaner and all that jazz.

What if I eliminate as much rolling resistance in the rear differential as I can. I've heard this can help but I am not sure to what degree.

Should I replace the stock carb for something more modern?

Should I use higher grade fuel on an old truck?

I know I ask a lot of questions, I just want to be sure I'm treating this beautiful machine right. It's my first big engine.