The Karma uses Q-DRIVE plug-in hybrid technology, developed exclusively for Fisker Automotive by Quantum Technologies. A fully-charged Karma burns no fuel for the first 50 miles.
Venture further and the gasoline engine turns a generator to charge the lithium ion battery. Once the 50-mile electric range has been exceeded, the car operates as a normal hybrid vehicle. This balance of electric and gas range makes it entirely possible that Karma drivers who charge their car overnight and commute less than 50 miles a day will achieve an average fuel economy of 100 mpg.