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. The total range on one 7-gallon tank of fuel is 444 miles.
The Flextreme also carries two Segway electric scooters that are charged from docking stations integrated into the car's cargo bay.
Last updated January 15 2008: 9:34 AM ET