What should the fuel mileage be on a 1989 ford crown Victoria 5.0?

The fuel mileage on a 1989 Ford Crown Victoria 5.0L will vary significantly depending on several factors: driving style, vehicle condition (tune-up, tire pressure), terrain, and the use of air conditioning.

However, you can expect roughly 15-20 miles per gallon (mpg) in combined city and highway driving. City driving will yield lower mpg than highway driving. Some owners might report slightly better or worse fuel economy. Anything significantly outside that range might indicate a problem with the vehicle.