As vehicles become more fuel efficient, the savings one obtains by further improving the mileage decline substantially. As an example, assume a driver saves $700 per year by switching from a 12 mile/gallon car to a 15 mile/gallon one. Now if that same driver has a car that gets 30 miles/gallon, she would need to switch to a 60 mile/gallon car in order to achieve the same $700 savings. In fact the incremental savings for each additional mile/gallon declines as the inverse square of a car's fuel efficiency.
This does not bode well for the future of alternative fuel automobiles. Saving $700 a year, as the example below shows, may not be worth paying additional few thousand dollars for a car that may be less convenient to "fill up".
Furthermore, as traditional gasoline cars become more fuel efficient, the savings associated with switching fall off sharply. In another few years, unless gasoline prices shoot through the roof (which is not likely), alternative fuel cars (such as electric) will increasingly be more of a "luxury" item rather than a money saving form of transportation. It's just basic math.
EIA: - As light-duty vehicle fuel economy continues to increase because of more stringent future greenhouse gas emission and Corporate Average Fuel Economy (CAFE) standards through model year 2025, standard gasoline vehicles are expected to achieve compliance fuel economy levels of around 50 mpg for passenger cars and around 40 mpg for light-duty trucks. Diminishing returns to improved fuel economy make standard gasoline vehicles a highly fuel-efficient competitor relative to other vehicle fuel types such as diesels, hybrids, and plug-in vehicles, especially given the relatively higher vehicle prices projected for these other vehicle types._________________________________________________________________________
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