I found that the duratech likes to rev for getting mileage. I have found that if I drive my car and maintain revs under 2500 rpm during acceleration and use 5th gear while cruising I'll get around 16-18 mpg around town, but if I go easy on the gas and run the revs up to just under IMRC (about 3500 - 4000) I can average 20 - 22 around town.
Last summer I took a 4 hour drive to new hampshire and I was averaging about 75 mph on the highway. I averaged 29 mpg.
