We're disappointed by the mileage as well. We are on the first tank (due to fill up today) and the display over the CD player says we are getting 20.6 mpg. That's a pretty long way from the EPA estimate of 33 on the window sticker. We do use the a/c because it's pretty hot and humid here in the subtropics. All of our driving is short trips and involves pretty steep hills so I guess that's why the mpg is so low--I was freaking out and thought something must be wrong with the vehicle, but found this website and am relieved that the vehicle is probably fine, but, again, we were expecting better mpg. One of my coworkers has a nonhybrid Highlander and claims to get a 3 mpg improvement by using premium gasoline. Can anyone confirm this?

Thanks for the nice forum,
Mike