* Engine size: While it was a 4-cylinder, the exact displacement (e.g., 2.5L) impacts fuel economy.
* Transmission: Automatic or manual transmission significantly affects MPG. Manuals generally get better mileage.
* Driving conditions: City vs. highway driving, terrain, speed, and even weather conditions all play a role.
* Vehicle condition: Proper maintenance (tune-ups, tire inflation) impacts fuel efficiency.
Therefore, there's no single definitive answer. However, a reasonable estimate for a 1988 Jeep Wrangler 4-cylinder would be in the range of 15-20 MPG combined (city and highway). Highway driving might yield slightly better results (perhaps up to the high 20s under ideal conditions), while city driving would likely be lower (potentially in the low teens). Keep in mind this is just an estimate; actual mileage can vary significantly.
