I've had a 96 4 cyl for nearly five years; I have always been dissapointed
in the gas mileage-- anywhere from 13 to 17 in the city.

For two days straight however, I used it to deliver stuff over 350 miles
each day-- never turned it off in nearly 10 hours, and drove routes from 30
mph in the city to 80 on the highway. When I did that it got 23 mpg. It
doesn't make any sense! Any ideas?