That will change when you hit the first hill.

Usually the automatic fuel economy gauge is pretty easy to get a great mileage reading from. I had a car that had one of those, one time I got 50 mpg rolling down a hill with my foot off the gas pedal, it dropped to about 6 going up the next hill, but I could have taken a picture when it read 50 mpg and bragged about the great gas mileage. The car, in reality averaged about 21 mpg. Gene