Opel Flextreme concept The Flextreme uses the same e-Flex drive system as the Chevrolet Volt concept car shown at the Detroit Auto Show in January. This time, however, a small diesel engine is used to provide on-board power generation. As with the Volt, the Fextreme's batteries can also be charged by plugging into an electrical outlet. The diesel engine provides additional charge only if needed and is never used to drive the car. On a full charge, the Flextreme can drive about 34 miles before the diesel engine starts.Total range on one 7-gallon tank of fuel is 444 miles. In addition, the Flextreme carries two Segway electric scooters. The scooters themselves are charged from docking stations integrated into the car's cargo bay.
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