I just filled up today with 371.2 miles on the odometer and put 20.014 gallons in the tank. That comes to 18.54 MPG! The only difference I can think of was I had to go from 87 octane to 89 octane because it was the regular grade fuel available at that station. Maybe a fluke? I had a good mix of highway and city driving with alot short trips under 5 miles in town.