GM has released fuel consumption estimates for its much vaunted electric car Volt, but the estimates seem more than a little ambitious. The company expects its Volt, which is scheduled for production from late 2010, to be able to travel up to 40 miles (64 km) on a single battery charge. Using a flex-fuel engine, the range should be extended to more than 300 miles (480 km). It also reckons that, with a charge a day from the regular electrical grid, commuters may rarely need to top up their fuel tanks. Although this does depend on distances traveled, passengers on board, air conditioning and other factors. "The 230 city mpg number (about 1.0 l/100 km) is a great indication of the capabilities of the Volt's electric propulsion system and its ability to displace gasoline," said Frank Weber, global vehicle line executive for the Volt. "Actual testing with production vehicles will occur next year closer to vehicle launch."Impressive, although it will be more interesting to see how these figures compare with real-time findings when they are made available. Volt has two modes of operation; electric mode, where no petrol is consumed and no emissions are produced, and extended range, when the engine kicks in to power the vehicle and charge the 16 kWh battery pack.