I finally got my first Jeep. A 2000 Sahara(automatic). Pardon the stupid question, but what kind of mileage can I expect? I took her on a road trip a couple weekends ago and got just over 300 miles on 16 gallons of gas. Then this week, I've been driving back and forth to work and was at 75 miles with 1/4 of a tank left. Should I expect such a swing in mileage? I just took her to the local Jeep dealership to have all the fluids changed and to have her looked over. The service guy just said that's a Jeep, but it doesn't seem right to me.