Thermobryan,

Diesals burn fuel differently, and I don't really consider 17 miles per gallon "good" gas mileage, especially comparing it to cars. SUVs get even worse gas mileage. My friend's dad's Suburban gets 12 miles/gal in the city and about 9 on the Interstate. The Suburban is, of course, gas fueled, not diesal. Either way, the gas mileage sucks.