Bought the car new in 2007 and have maintained all oil changes with 0-20w full synth. oil and drive mostly highway miles. Continuous driving on trips of 8 plus hours. Was amazed that the car was producing 40 miles to the gallon on the highway. These trips are on the west coast over mountains and super curved roads. So far the window sticker was right about the MPG except in the reverse. Better on the highway.