Don,

If your friend is only getting 36.8 MPG there is something really wrong. That is one of the lowest MPG I ever heard of for the Prius. He should be in the mid to upper 40's at least. My niece lives in Phoenix and drives a Prias and I saw her log when she came up for a visit. She is usually getting around 50 or 52 and she doesn't hypermile. Good luck.