Subaru concept car: first turbocharged hybrid

This type of hybrid car could deliver even better performance with a flex fuel, variable boost turbocharged engine. On E85, such an engine could be boosted much more because of ethanol's high octane. This would result in better fuel efficiency and power.
Detroit Auto Show (NAIAS) 2006 - Environmentally Friendly Subaru Concepts - MSN Autos:
1/9/2006

With the turbo engine mated to the electric motor in the B5-TPH, fuel efficiency is improved some 30 percent over a comparable gas-only vehicle, officials said.
At the same time, the car has "powerful acceleration that's typical of turbo engines," said Takao Tsuchiya, corporate executive vice president of Subaru's parent company in Japan, Fuji Heavy Industries Ltd.