Thank you for your input - I will check the plugs and check the mileage again once I have gone through one tank of gas. I did fill up with premium and would be happy with 17-18 all around and 15 in town. The previous owner drove it here (Omaha) from California and said they got 26 mpg at 65 mph when they moved here 3 years ago, so it may just be needing a good run to clean out the fuel system. Thanks!