Can You Get More out of Your Hybrid?

Ron Gremban shows off the power cord and extra batteries on his 'hacked' '04 Prius

Ron Gremban shows off the power cord and extra batteries on his "hacked" '04 Prius, which he says gets him more than 100 mpg in city driving. Martin Kaste, NPR hide caption

itoggle caption Martin Kaste, NPR

A tiny group of enthusiasts in California say they've demonstrated how to push your Prius to get as many as 99.9 miles per gallon — if you're willing to plug it in overnight. Toyota says that although the idea is intriguing, it's not ready for prime time.

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