full charge takes around 4 hours. The Volt comes with a charging cord suitable for the standard household power outlet in its country of sale. If plugged in, recharging can be controlled remotely through a smartphone application. Others To save energy, the Volt sometimes heats the seats instead of blowing heated air through HVAC system, as heating the vehicle's cabin draws significant power, and can even exceed what is needed to move the vehicle on occasions. A power-saving stereo system uses amplifiers that switch on and off rapidly to save power. It uses 50 percent less energy. The system is also lighter because the use of high grade neodymium magnets. Performance The Volt has a top speed of . According to Edmunds.com road tests, the Volt's 0 to 60 mph acceleration time is 9.2 seconds running on electric-only mode, and 9.0 seconds with the gasoline engine assisting propulsion. Motor Trend reports the Volt's quarter-mile (402 m) time is 16.9 sec at , while Edmunds reports a quarter-mile (402 m) time of 16.8 sec at in electric-only operation, and 16.6 sec at with the gasoline engine assisting. Motor Trend reports a braking distance of and Edmunds.com of . Range According to General Motors the Volt's all-electric range with fully charged batteries varies from depending on terrain, driving technique, and temperature. The 2013 model year Volt increased its EPA's rated all-electric range to . The 2014 and 2015 Volt have the same EPA ratings. The Opel Ampera official all-electric range under the EU-approved UN ECE R101 standard for plug-in hybrids is . Fuel economy United States The U.S. Environmental Protection Agency (EPA) officially rated the 2011 model year Volt's combined city/highway fuel economy in all-electric mode at 93 miles per gallon gasoline equivalent (MPG-e) (2.5 L gasoline equivalent/100 km; 112 mpg-imp gasoline equivalent) and 94 MPG-e for the 2012 model year. For the 2012 model year, EPA revised the Volt's fuel economy ratings, increasing the combined city/highway rating in all-electric mode from 93 MPG-e to 94 MPG-e, and the highway rating was increased from 90 MPG-e to 93 MPG-e. As a result of its improved battery pack, the 2013 model year EPA rating climbed to a combined city/highway fuel economy of 98 miles per gallon gasoline equivalent (2.4 L gasoline equivalent/100 km; 118 mpg-imp gasoline equivalent). Europe The Opel Ampera official equivalent fuel consumption under the EU-approved UN ECE R101 standard for