This is also tempting. We tested one, but I don't want to be the early adopter while undiscovered bugs are worked out of the system. 45-48mpg if the estimates are to be believed.

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2013 Volkswagen Jetta Hybrid SEL Premium (Sparky)
http://badges.fuelly.com/images/smallsig-us/193500.png

It's a car not a science experiment! Open the throttle!