Seattle has outfitted more than a dozen Toyota Prius hybrids with new plug-in technology to squeeze even better fuel efficiency from the eco-wonder.
City officials were intrigued by data suggesting they could cut their fuel consumption in half by using batteries charged directly from the grid. If claims are to be believed, drivers would routinely see 100 mpg using readily available battery packs installed in the trunk.
Just over a year after performing the conversions, the city says it is thrilled with the cars. The plug-in Prius hybrids have used less gas and emitted less CO2 than their conventional counterparts. But the tests also have put a big dent in the plug-in promise.
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