How can i get better mpg for my '92 Ford Bronco with a 302 8 cyl engine?

Well in all honesty there isn't much you can do, I have a 1991 F-150 with the 302 and I've done just about all I can but with minimal to no improvements. Just stay on top of engine service and maybe try running some fuel injector cleaner along with engine gum out stuff, best bet is Lucas Oil products. You could go to the extent of putting in a cold air intake and maybe a minor throttle body spacer but they're expensive and it doesn't help out that much. Besides, once you do those after market changes it will run a lot stronger so it might be hard to drive economically. If anything just try to be light on the pedal and shift at low RPM's, that a definite gas saver.