New Rules from EPA on 2008 Cars & Medium Duty Vehicles
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Via Green Car Congress: The Environmental Protection Agency (EPA) has issued its final ruling on how fuel economy is calcuated and posted for new cars. The methods, last revised in 1984, are now supposed to provide closer to real MPG for most drivers. This means, ta da, the estimates posted for the cars will be dropping.
Compared to today’s estimates, the city mpg estimates for the manufacturers of most vehicles will drop by about 12% on average, and by as much as 30% for some vehicles. The highway mpg estimates will drop on average by about 8%, and by as much as 25% for some vehicles.
The decreased fuel economy, the EPA took pains to point out, is not a result of a change by the automakers, but in the agency’s methodology for estimating performance.
This will have an impact on the perception of hybrids as well:
In vehicles that achieve generally better fuel economy, such as gasoline-electric hybrid vehicles, new city estimates will be about 20 to 30% lower than today’s labels, and new highway estimates will be 10 to 20% lower, according to the EPA.
The nature of current hybrid technology—the addition of a battery as a second source of on-board power, sophisticated control systems, and sometimes a smaller engine—makes a hybrid’s fuel economy more sensitive to certain factors, such as colder weather and air conditioning use.
The new calcuation method and posting of information will be on all 2008 models, including for the first time medium-duty trucks. And the auto industry being what it is, you can expect some 2008 models in showrooms in the first few months of 2007.