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1998 Cherokee Sport 4.0L Standard Transmission...averaging about 21 mpg overall. Rudyg, do you have the 4.0L engine? If so, how are you managing such high mileage? Did you have a noticable increase in fuel economy when you put on the K&N air filter?

Yes it has the 4.0L. The K&N kit added about 3-4 mpg. I also tend to shift a little early, so that helps get a little better fuel economy.