That's what I do now. I usually average 22-23 mpg with my city and highway driving. I've driven it dry and got 300 miles on the dot, awful lol. But I haven't done that since I put my throttle body screen back in so it may be different now. I haven't gone a tank yet. I got impatient last night and filled up with a 160 miles driven, majority highway, and burned through 7.7 gallons which averaged to 20.7 which is what my dic mpg said. I nearly cried lol