Did my highway trip, lots of miles to try it out. Turns out it works well in town, but highway speeds aren’t necessarily better. I got 51.0 mpg over probably 140 miles, will be filling it up tomorrow when I return it. That should tell us if the gauge is accurate. I was surprised to see the gas gauge drop as far as it did over those miles. Fuel economy.gov says it is a 13.2 gallon tank. I thought it was going to have more range than my accord would when hypermiled, but that does not seem to be the case.
Ambient temperature ranged from 90-95F, highway speed usually 65 mph, 50 mph on rural roads, and no A/C! No fan either, I just cracked the windows. Sweat was beading up on my arms.
When you shut the car off, it shows your trip mileage (since last restart), and gives you the option of saving the best mileage. So future renters and owners will just stare at that 57 MPG and wonder what the hell someone did to make that happen!