jladue
EF1
A colleague just got a 2008 Prius and gave me the tour. The energy monitor screen alone is worth the admission for a gadget geek. I wish they'd make a hybrid with four-wheel electric drive for the sticky spots. What a great feature that would be! For whatever reason, though, the Prius' freeway gas mileage isn't very spectacular, and running the A/C should keep the gas engine powered up most of the time.
I've had a Prius since 2005. Here's a plot of gas mileage from 2005-2006 by tank. My chasing has averaged 42-47 mpg. My worst mileage has been highway driving in extreme cold with a headwind. However during my worst mileage, my friend was driving in tandem with a Honda Civic and averaged 8mpg worse.