My dad has a 4-door Ford 4x4 Diesel. He gets appr. 17 miles/gal. in the city and appr. 20 miles/gal. Here in SC, high test gas is averaging $2.05/gal, mid-grade $1.95/gal, and low-grade $1.85/gal. Diesel averages about $1.80/gal. The fuel maybe cheaper by looking at the cover but when comparing it to my car, which is a 2003 Chevrolet Malibu, my car gets 25-30 miles/gal in the city and 30-35 on the Interstate. I spend maybe $17-$18 every week and a half. My dad spends between $25-$35 every week! Also, the pollution is terrible from a Diesal engine. I choke everytime I am outside and near his truck when it's running.