Today, my son drove 4 hours: 2 hours in a 25 miles per hour subdivision with many stop signs, and 2 hours on a 4-lane highway with no lights or stops. We logged about 115 miles total, and my mpg dropped from 80.2 to 69.6 at about 382 miles on the trip meter. He dropped from 70.0 to 69.6 just trying (3 or 4 times) to back into the driveway.

I will have to work on getting this tank back up tomorrow.