The Quantum Mechanic

Good presentation here (PDF file).

We generally get around 48mpg with the Prius on the highway, usually going 70+ mph. Today I happened to have the opportunity to make a 214 mile round trip. Went from A to B at 65mph and B to A at 55mph (A and B are at about the same altitude). Got 54mpg from A to B and 61mpg from B to A.