If you own this car, you can test it yourself:If you want to accurately measure you MPG, do these steps1) fill you tank to the max(2) reset the odometer (tripometer)(3) drive on the HWY (at 55 for comparison to other cars)(4) drive using cruise control - to eliminate bad habit (VERY IMPORTANT)(5) drive about 30 minute / 30 miles (longer = more accurate)(6) now get gas again - fill it the MAX(7) note the gallon just filled AND mile drive.(8) calculate MPG = miles / gallonYou cannot use your GAS gauge to know if you finished using the gas. Also if you don't use the cruise you are putting in your driving habit, traffic, etc. on different days as variable. So you should do this at evening or night hours.You can also use this technique whenever you think your car is gets better or worst MPG. It only cost you about 1 gallon of gas ($4) and that is cheaper than paying a mechanic to find ghosts (problems that doesn't exists).Good Luck...