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Here is one I have not seen, a hybrid version of the EV-1.
EV1 Series hybrid
The series hybrid prototype used a stretched EV1 body and 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 alternative fuels, from octane-boosted gasoline to compressed natural gas to Aviation Kerosene. 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.
There was also a research program[31] that powered the series hybrid Gen2 version from Stirling engine based generator. The program demonstrated the technical feasibility of such drive train, but concluded that commercial viability was out of reach at that time.
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