If you're going to sell hybrids purely for money savings, fleet operators are a good customer. XL Hybrids, founded by MIT students, has developed a system and business model around retrofitting existing cars, and later vans, to operate as hybrids. A generator is attached under the car and a battery in the trunk, giving fleet owners better mileage and fuel savings.
March 7, 2011 9:25 AM PST
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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