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FUEL EFFICIENCY * USA
* Michigan - Gallons per mile better? Experts urge making mpg math less fuzzy
Detroit,MICH,USA -The Detroit News, by Karl Henkel -February 13, 2013: -- Drivers of some cars are learning that gas-mileage estimates on window stickers overpromise what they really get on the highway. That's reigniting a debate on how to calculate fuel economy... The auto industry is under a more watchful eye... Some suggest it's time to rethink mileage testing for all vehicles, as automakers prepare to meet the 54.5 miles-per-gallon Corporate Average Fuel Economy fleet standard by 2025... Drivers of a vehicle averaging 54.5 miles per gallon by CAFE standards won't get anywhere close to that mark. They probably won't even squeeze 43.6 mpg — the EPA window-sticker figure that is equivalent to the CAFE calculations... Real-world drivers are far more likely to get about 35 miles per gallon, more than a 30 percent reduction from the original CAFE number, according to analyst estimates, because real-world driving conditions are a far cry from laboratory tests...
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But even with testing changes, all vehicles' fuel-efficiency ratings will still be misleading, said Richard Larrick, professor of management at Duke University's Fuqua School of Business... Larrick and his colleague, Jack Soll, say gallons per mile — GPM — is a more consumer-oriented way of measuring fuel efficiency... Their study found in 2008 that most drivers thought going from 34 to 50 mpg saved more gas over 10,000 miles than an improvement from 18 to 28 mpg. In fact, the latter saves 198 gallons over that span, compared to 94 gallons... Fuel efficiency in Europe is measured in GPM — actually, liters per 100 miles. But that yardstick is unlikely to be adopted in the U.S...
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