the Volt was launched, General Motors reported that cumulative miles driven in electric mode had passed the 100 million mark on November 30, 2012. The carmaker also reported that Volt owners have driven more than 65% percent of the time in all-electric mode, and on average they drive around , or a month and a half, between fill-ups. A similar report, issued by GM in August 2016, reported that Volt owners have accumulated almost 1.5 billion miles (2.4 billion km) driven in EV mode, representing 60% of their total miles traveled. A 2014 analysis conducted by the Idaho National Laboratory using a sample of 21,600 all-electric cars and plug-in hybrids, found that Volt owners traveled on average 9,112 miles in all-electric mode (e-miles) per year, while Leaf owners traveled 9,697 e-miles per year, despite the Volt's shorter all-electric range, about half of the Leaf's. BMW i3 BMW i is offering the BMW i3 all-electric car with an optional gasoline-powered range extender engine added. The range extender is powered by the same 647 cc two-cylinder gasoline engine used in the BMW C650 GT motorcycle with a fuel tank. The range extender engine only engages when the battery level drops to a pre-specified point, acting purely as a generator to produce electricity to extend the range from to The i3 performance in range-extending mode may be more limited than when it is running on battery power, as BMW clarified that the range extender is designed not for long-distance travel but purely as an emergency backup to keep the electric system going until the next recharging location. The range-extender option costs an additional in the United States, an additional (~ ) in France, and (~ ) in the Netherlands. Free loaners As a mitigation to range anxiety issues, some carmakers are offering the use of a gasoline-powered standard car for free with the purchase of an electric vehicle to mitigate, thus allowing their customers to cover long trips on a certain number of days per year. BMW i BMW i is planning to offer additional mobility packages for trips where the range of an BMW i3 would not be enough to allow customers to cover longer distances, including the provision of a conventional BMW vehicle on a given number of days per year. In areas of high sales, BMW will also offer a roadside assistance program, which, instead of a tow, the assistance