Here's an interesting bit of information:
General Motors EV1 - Wikipedia, the free encyclopedia
Quote:
EV1 series hybrid
EV1 series hybrid prototype at EVS-16 in Beijing, 1999
The series hybrid prototype[61] had a gas turbine engine APU placed in the trunk. A single-stage, single-shaft, recuperated gas turbine unit with a high-speed permanent-magnet AC generator was provided by Williams International; it weighed 220 lb (99.8 kg), measured 20 inches (50.8 cm) in diameter by 22 inches (55.9 cm) long and was running between 100,000 and 140,000 rpm. The turbine could run on a number of high-octane[citation needed] alternative fuels, from octane-boosted gasoline to compressed natural gas. The APU started automatically when the battery charge dropped below 40% and delivered 40 kW of electrical power, enough to achieve speeds up to 80 mph (128.8 km/h) and to return the car's 44 NiMH cells to a 50% charge level.
A fuel tank capacity of 6.5 US gal (24.6 L; 5.4 imp gal) and fuel economy of 60 mpg-US (3.9 L/100 km; 72 mpg-imp) to 100 mpg-US (2.4 L/100 km; 120 mpg-imp) in hybrid mode, depending on the driving conditions, allowed for a highway range of more than 390 miles (627.6 km). The car accelerated to 0-60 mph (96.6 km/h) in 9 seconds.
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There was also a parallel hybrid version of the EV1, as well:
Quote:
EV1 parallel hybrid
The parallel hybrid variant featured a de-stroked 1.3 L turbocharged DTI diesel engine (Isuzu Circle L), delivering 75 hp (56 kW), installed in the trunk along with an additional 6.5 hp (4.8 kW) DC motor/generator; the two motors drove the rear wheels through an electronically controlled transaxle. When combined with the AC induction motor which powered the front wheels, all three power units delivered a total output of 219 hp (163 kW), accelerating the car to 0-60 mph (96.6 km/h) in 7 seconds. A single tank of diesel fuel could keep the car running for 550 miles (890 km) with a fuel economy of 80 mpg-US (2.9 L/100 km; 96 mpg-imp)
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If you do the MPGe calculation, the diesel's 80MPG is 72MPGe, while the serial hybrid got 60-100mpg. Hmmm.