Being shown at the Clean Vehicle Technology Expo in Ontario, California is Hymotion's modified Prius that can hit up to 150MPG in city areas. By adding a 175 pound battery pack to the trunk of a Prius -- which fits conveniently under the floor panel -- and charging overnight using a regular power plug, owners will be able to drive for up to 50 miles on battery power alone: that's well over the average motorist's daily journey. It'll cost $9,500 including installation, but according to one of the staff at the show, half of that could be covered by rebates as part of a new electric cars bill soon to be before Congress. Onwards we go, tip toeing towards a petrol-free future.

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