receive the original pack back from Tesla for a transport fee. Pricing had not been determined. Range extender Series plug-in hybrids Plug-in hybrids (PHEVs), as opposed to pure electric cars, eliminate the range anxiety concerns because the gasoline engine serves as a back-up to recharge the battery to provide electric power to the electric motor, or to provide propulsion directly. Access to a regular fuel station guarantees that a PHEV has similar driving ranges as conventional gasoline-powered automobile when required. Nevertheless, a study conducted by the Norwegian Institute of Transport Economics published in June 2016 found that plug-in hybrid owners in Norway drive on average 55% of their annual kilometers in charge-depleting or all-electric mode (EV mode), and the share goes up to about 63% for work trips. However, parallels and series-parallel hybrids operate most of the time in blended mode while charge-depleting. Because the Toyota Prius Plug-in Hybrid operates as a series-parallel hybrid, the U.S. EPA estimated its all-electric range for blended operation on a combination of electricity (from a fully charged battery pack) and gasoline as until the battery is depleted. Other plug-in hybrids that operated mostly in blended mode are the Ford C-Max Energi, Ford Fusion Energi and Honda Accord Plug-in Hybrid. On the other hand, series hybrids, also been referred to as extended-range electric vehicles (EREV) or range-extended electric vehicles (REEV), are designed to be run mostly by the battery, but have a gasoline or diesel generator to recharge the battery when going on long trips. The Chevrolet Volt, Fisker Karma and the upcoming Cadillac ELR are series plug-in hybrids. Chevrolet Volt General Motors describes the Chevrolet Volt as an electric vehicle equipped with a "range extending" gasoline-powered internal combustion engine (ICE) as a genset and therefore dubbed the Volt an "Extended Range Electric Vehicle" or E-REV. In a January 2011 interview, the Chevy Volt's Global Chief Engineer, Pamela Fletcher, referred to the Volt as "an electric car with extended range." The first generation Volt operates as a purely electric car for the first in charge-depleting mode (EV mode). When the battery capacity drops below a pre-established threshold from full charge, the vehicle enters charge-sustaining mode, and the Volt's control system will select the most optimally efficient drive mode to improve performance and boost high-speed efficiency. The range in EV mode of the second generation Volt was increased to . In December 2012, two years after