http://www.nytimes.com/2009/12/15/bu.../15toyota.html
Quote:
The car travels 23.4 kilometers, or 14.5 miles, as an electric vehicle on a single charge before a regular gas-electric hybrid system kicks in. It gets an overall mileage of 57 kilometers a liter, or 134 miles per gallon — exceeding the Prius’s 38 kilometers a liter, according to Toyota.
The plug-in Prius would charge in about 100 minutes and halve the running cost of traveling 30 kilometers in comparison with a regular Prius if recharged at night, when electricity costs are often lower, Toyota said.
The automaker says it also plans to sell a pure electric “urban commuter” vehicle in 2012 that would run on lithium-ion batteries.
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Numbers like 134mpg are fun to say, but they don't tell the whole story. Regardless, 14.5mi of electric range would be enough for many people to commute on zero gasoline. Having some PHEVs like this and the Volt on the road will drive development of plug-in infrastructure, paving the way for electric vehicles.
Not yet announced: how much it costs, how much it weighs.