Californians who have high-fuel efficiency vehicles – like a Prius – also tend to choose a gas-guzzler as a second car of choice, according to a new University of California at Davis study. The study’s authors liken the trade-off in fuel economy to the “diet soda effect,” people who consume diet drinks and then use that decision to justify eating high-calorie foods. That means if drivers own a Tesla, then they might feel it’s OK if they also own a BMW X-5 SUV for weekend driving. Sad.

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Earthgarage – Greener Car. Fatter Wallet.