Why are the VOLT and LEAF EVs measured in Miles Per Gallon? | Electric Vehicle News: "This 'utility factor' or 'Driving Pattern Factor' is just one variable in what the DoE/EPA officially call the 'petroleum-equivalency factor' (PEF) which has been on the books since July 2000. The background is that Congress wanted to allow auto manufactures to quote high equivalent 'fuel economy' for electric vehicles as an incentive to help accelerate the commercialization of electric vehicles. While the formula is based on the actual energy consumption of the vehicle it also includes correction factors that take into account 'upstream' factors such as national average electricity generation and transmission efficiencies, the need for national energy conservation in all forms, and an EV driving pattern factor.
The Petroleum Equivalency Factor starts with PEF = Eg * 1/0.15 * AF * DPF
1) Eg = Gasoline-equivalent energy content of electricity factor
2) 1/0.15 = the 'Fuel content' factor
3) AF = Petroleum-fueled accessory factor
4) DPF = Driving pattern factor"
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