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Less than a quarter of the hybrids tested were cheaper to run than gas-powered cars.

Lower fuel costs and higher gas-powered fuel economy narrows the gap in vehicle-operating costs.

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'Real world' MPG would have to rise to about 40 mpg under the current rules.

Don't tell the EPA it can't be done.

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New stakeholder Nissan is also planning on Mitsubishi improvements.

One investigator said it was a 'collective failure.'

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Meeting the US's 2025 fuel-efficiency mandate may be difficult without electrification.

Mazda continues to wring out more fuel efficiency from its Skyactiv gas-engine technology.

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Stop-start systems can boost urban MPG by about six percent.

General Motors will offer a stop-start option on nearly all models by the end of the decade.

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The widening scandal could lead to Nissan gaining control.

Mitsubishi says its shady fuel-economy test practices may have been used on all vehicles it sells and has sold in Japan.

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The latest version of the T25 city car debuts at the Beijing Motor Show.

The T25 was thrifty before, but the new version wearing a Shell suit is even fitter.

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VW scandal spurred Peugeot Citroen's efforts for better diesel efficiency measurement.

French automaker Peugeot Citroen releases more realistic fuel-economy figures for three diesel models.

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Agency Will Be More 'Unpredictable' In Checking For Cheaters

In the wake of the Volkswagen emissions-cheating scandal, the Environmental Protection Agency vowed to crack down on the auto industry with renewed vigor. That process has started.

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A new study released this month from the University of Michigan's Transportation Research Institute found that the average fuel efficiency of America's fleet has only risen by 3.6 miles per gallon in the last 92 years.

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May Marked Highest Figure Since Record High Last August

Americans boost new-car fuel-efficiency in May by 0.3 miles per gallon to 25.5 mpg, according to the latest UMTRI report.

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Results Still Mixed As Fewer Light-Duty Trucks, SUVs Meet Current Standards

Consumer Federation says 2025 CAFE standards are "achievable" and that automakers are making progress.

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Fuel-Efficiency Down 0.6 MPG From August 2014 Peak

The average US new-car fuel economy fell 0.2 miles per gallon to 25.2 mpg for April.

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A recent study from the University of Michigan Transportation Research Institute finds that planes are more efficient than cars by a wide margin. The gap between them isn't shrinking quickly, either.

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The 2016 Mazda MX-5 Miata now has its fuel-economy ratings from the EPA, and the roadster sees a 25-percent improvement compared to the previous generation. Either transmission offers 30 mpg combined.

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Six-Speed Transmission Helps Mazda Beat Out Honda, Hyundai Models

The next-generation Mazda2 will increase fuel economy by about 15 percent.

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Fuel Efficiency Remains Below August 2014 Peak

New vehicle fuel economy in the US last month averaged 25.4 mpg, up 0.2 mpg from February.

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Fewer Accidents Mean Less Pollution, Right?

Automakers lobby to get federal government to offer fuel-economy credits for safety features.

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Blue Oval's Fuel-Efficiency Emphasis Lures Younger Car Buyers

Younger drivers prefer cars over trucks or SUVs because of fuel efficiency, and they like Ford more than any other automaker, according to a new study from MaritzCX.

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Far Fewer Gas Guzzlers, Far More Fuel Sippers On The Market

2014 model-year US vehicles averaged 25.3 mpg, a 22-percent jump over your average 2008 car.

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Nissan Leaf Sales Fall, While Toyota Green Car Sales Little Changed

US green-car vehicle sales in January fell 8.6 percent from a year earlier, as Ford, General Motors falter.

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