I just came home from a 1710 mile long trip.
Often I don't fill for a month or so. I carpool with a coworker as much as possible. On these months my mileage is not great due to my in-town driving.
But, on the trip we attained some good mpg and I was quite pleased with the average. Keep in mind that my wife drives with one foot on the gas and the other on the brake. She was behind the wheel around 30% of the time and once I caught her going near 100mph. (this is not unimaginable - I have done many aero-mods to the car so it is able to handle the speed and is quite stable, plus I have 13inch tires with a swift transmission which keeps my rpm down to 2700 @60mph and ??@ 100mph)
Just wanted to share.
S.