Electric vehicle with range extension received official mileage certification of 52 MPGe from U.S. government.

Fisker Automotive has received an EPA (the U.S. government's Environmental Protection Agency) rating for its Karma EV with extended-range.

The official EPA rating is 53 MPGe, which is derived from a complex formula that converts energy used in an electric vehicle with an extended-range internal combustion engine (like the Karma) into a miles-per-gallon-based rating.

The EPA also found the Karma's all-electric range to be 32 miles (51.5 km). That's less than Fisker's original claim of 50 miles (80.5 km). Despite the difference, Fisker stands by their figure and asserts most Karma drivers will achieve the later figure. 

Fisker also claims an overall range of 483 km (300 miles) for the Karma. However, to give an example of its potential, Fisker states in a press release, "a Karma driver with a 40-mile commute who starts each day with a full battery charge will only need to visit the gas station about every 1,000 miles and would use just 9 gallons of gasoline per month."

The Fisker Karma comes with a 20kW lithium-ion battery which powers two electric motors that develop a total of 408 PS (300 kW / 402 hp) and 1,300 Nm (959 lb/ft) of torque. The Karma accelerates from 0-100 km/h in 5.9 seconds and has a top speed of 200 km/h (124 mph).

Range-extension is provide by a turbocharged 2.0-liter petrol engine which acts as a generator to recharge the batteries when they are depleted. In this mode the gasoline engine achieves a dismal 20 mpg.