to pure battery electric, to fuel cell-powered or to several other sources of energy to create electricity on board, such as engine-generator sets (genset) fueled by gasoline, diesel, biodiesel, ethanol fuel (E100), or flex-fuel (E85). Regenerative braking would also contribute to the on-board electricity generation. In October 2006 the E-flex powertrain was selected for the new propulsion architecture and the name Volt was chosen by General Motors. The Volt concept car became the first application of the E-Flex (Voltec) drive system with a combination of an electric motor, the same used in the Chevrolet Equinox Fuel Cell, a lithium-ion battery pack with 136kW of peak power, and a genset consisting of a small 1.0L, 3-cylinder turbocharged flex-fuel capable engine linked to a generator. General Motors called this genset an electric vehicle (EV) range extender. The vehicle was propelled by an electric motor with a peak output of delivering of motoring torque. The Volt concept featured a fuel capacity providing the vehicle a total driving range of around , which considered a gasoline fuel efficiency of about and a all-electric range. According to General Motors estimates, a daily drive of , combined with an overnight recharge to support the first 40 all-electric miles, would yield an effective gasoline fuel economy of . General Motors also emphasized that the Volt would further reduce dependence on imported oil if E85 ethanol was used instead of gasoline to power the on-board generator engine. Robert Lutz added that if the driver used E85, "the fuel economy figure became 525 miles per (equivalent) petroleum gallon", as only 15% of gasoline is used in this blend. General Motors also noted that actual production of the Volt depended on further battery development, because the required rechargeable batteries needed to make the Volt a viable vehicle did not exist in the market and had yet to be developed. The concept car was actually powered by two 12-volt conventional car batteries, just enough power to allow the vehicle to move at low speeds in the stand. Lutz initially said the Volt was expected to sell around $30,000, based on the cost of a conventional car of that size with a conventional four-cylinder engine plus US$8,000 for the lithium battery. Developers faced cost escalation as they found out the Volt could not share components from GM's compact car platform like power steering, power brake, air-conditioning compressor that were driven by a