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...electric car, so long promised, may finally be pulling into your driveway. In the U.S., a humbled General Motors just showed off one of its rare rays of light - the plug-in Volt, which GM says will get 230 miles per gallon when it hits roads in late 2010. Daimler is trialing an electric version of its baby Smart car and claims to get the equivalent of 300 m.p.g. In Japan this month, a confident Carlos Ghosn said that Nissan's upcoming, all-electric Leaf will get 367 m.p.g...
...EREV testing process, like the one that California's Air Resources Board (ARB) uses, may not actually measure gasoline usage at all but rather kilowatt hours per 100 miles, or kWh/100m. That figure is converted into miles per gallon, which effectively makes miles per gallon irrelevant...
...average cost of electricity (approximately 11 cents per kWh), a typical Volt driver would pay about $2.75 for enough electricity to travel 100 miles, or less than 3 cents per mile. (Conversely, a gasoline-powered car that gets 20 m.p.g., for which the driver pays $3 per gallon, has a per-mile fuel cost of 15 cents...
...Also, if you use the electric vehicle's or hybrid's electric-only mode, the miles per gallon are "infinite or have no meaning since no gas is being consumed," according to Anthony Eggert of California's ARB. Of course, it takes oil, coal, nuclear, wind or hydro power to create the energy electric cars are powered on, so even eco saints don't get off free. To complicate matters further, if you want a hydrogen-fuel-cell-powered vehicle, like a Honda FCX Clarity, you will need to measure mileage in m.p.k., or miles per kilograms of hydrogen...
...Eggert is in charge of science and technology policy for the state agency, which sets greenhouse-gas performance standards (GHGP) and develops "miles per gasoline gallon equivalents" (MPGGE) for electric and hydrogen-fuel-cell vehicles so it can rate the amount of harmful CO2 released into the air. It's all very confusing and is likely to get even worse, according to Eggert, who doesn't "even bother" with GM's 230-m.p.g. claim. "We ignore such claims entirely," he says. "We look at total energy consumed so we can figure out how much greenhouse gas is being emitted into...