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Chris Cox of Derry, N.H., got tired of waiting for the electric car of the future. In August, he took matters into his own hands and had his 2008 Toyota Prius converted into a plug-in hybrid, which doubled its gas mileage — Cox now gets up to 100 miles per gallon for 30 to 40 miles at a stretch. Although the Prius is already a hybrid gas-electric model, the additional battery that Cox had installed enables him to travel more than 20 miles on all-electric power (compared to just two miles without it) before the gas engine kicks in.

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