I drive 36,000+ miles a year on average - I would have killed for a VW Diesel GTI but they were not selling them in 2008. I was getting around 15-18MPG in a van with no AC or heating and I had my break-even threshold set at $2.37 a gallon. My plan has always been to drive the Prius until the wheels fall off and the battery stops charging, and even then I might do an after-market mod to make it plug-in. I get tired of people making me defend my purchase all the time. TFA based the miles driven at 20,000km - I drive 3x that. Plus I paid just $28k for the car not $40k as in TFA (might be a difference in USD/loonies there though).