Properly sized tires, a good tune-up including a good air cleaner filter, and driving a few mph slower help a bit.
I am guessing it is a 302 or 351 and will get about 12-14mph.
1994 Ford Mustang GT
1990 Ford Bronco II
2001 Lincoln LS V8
1970 Ford Bronco
2006 Harley-Davidson Sportster Custom
If you don't already own a Ford (or Ford owned product), get one.