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After the huge problems that Hyundai/Kia experienced with its mislabeled fuel economy labels, you'd think that any time an automaker has to adjust its mpg numbers, heralds would be shouting from the rooftops. But, after Ford admitted to three big mistakes with its numbers for the 2013 C-Max Hybrid and Mercedes-Benz had to lower the fuel economy rating for the C-Class, we understand if those heralds are a bit tired by now.

What, you expected the "fastest muscle car ever" to help fleetwide fuel economy? Nope, don't think that's going to happen. That means Fiat Chrysler will likely to continue to languish at the bottom of the heap when it comes to fleetwide fuel economy among the largest automakers serving the US, especially as the automaker starts to sell its Dodge Challenger SRT Hellcat. A few hundred Fiat 500E electric vehicles aren't going to turn the trend around.

Talk about a report both green-car advocates and gearheads can celebrate. The US Environmental Protection Agency (EPA) put out its annual Light-Duty Automotive Technology, Carbon Dioxide Emissions, and Fuel Economy Trends report. And the 148-page study has something for everyone.

Fuel economy is up almost 5 mpg since 2004

Gas mileage for new cars and trucks in the U.S. averaged a record 24.1 miles per gallon last year, but gains in fuel economy are slowing.

2013 Model Year Was Half-Gallon MPG More Efficient Than 2012

Well done, America. Through some combination of market forces and government regulations and advancing technology, you've managed to buy enough fuel efficient vehicles to raise the overall average for the 2013 model year to 24.1 miles per gallon – that's 0.5 mpg higher than model year 2012. It's also an all time record high.

New EPA Labels Are Up To 1 MPG Worse Than Before

*UPDATE: Donna Boland, manager of corporate communications at Mercedes Benz USA, told AutoblogGreen that the sticker change only applied to around 500 C-Class vehicles on dealer lots, since a new C-Class came out in late August. "About 500 are left in the United States, and we've relabeled them," she said.

Elio Motors is taking its green-is-good mentality to its factory equipment. The company, which is planning to make super-light three-wheeled vehicles that get 84 miles per gallon, will finally start making trikes next year. The plan is to sell off extra equipment from an old General Motors factory to do so.

Toyota Highlander Hybrid Knocks Out Midsize SUV Competition

Consumer Reports takes its independent vehicle testing procedures seriously. In an era when we have to question the EPA's official ratings thanks to recent re-evaluations from Ford and Hyundai, an independent voice is important. So, when CR says something is the best, it's worth paying attention to.

Most cars use a 12-volt system to power their electrical components. But, with more and more electric bits and bobs being added to new vehicles, a dozen volts is looking a bit weak these days. In fact, Audi says that standard 12-volt systems are being stretched "to their very limits." Enter 48 volts.

Company's Best Today Gets 28

It is totally possible, today, to take the Ram 1500 EcoDiesel pickup truck, load it up with gear and people, and drive it from Texas to Michigan while getting 38 miles per gallon. We know because we did it. Officially, though, the 1500 gets just 20 mpg combined. A more impressive number is the 28 mpg on the highway.

Groups call for MPG clarity in advertising

Google Street View is looking for gas leaks. Natural gas leaks are not only extremely dangerous, they're a terrible waste of resources and, as a greenhouse gas, a threat to the environment. Unfortunately, with the decaying infrastructure in many of America's older cities, they're pretty common, too. That's why Google is teaming up with the Environmental Defense Fund to map gas leaks. With sensors attached to the Street View cars, they are sniffing out methane leaks and documenting them. So far,

The agency thinks the new approach will result in more realistic ratings, especially for hybrids.

Scroll down the leaderboards of Nürburgring lap times and you'll see mostly racing cars, supercars and sports cars. Delve deep enough and you'll eventually get to hatchbacks and sedans, albeit the most performance-focused of their kind. But a hybrid? Sure, the Porsche 918 Spyder posted the top time for a street-legal series production car, and it's technically a hybrid, but we're talking about another kind of hybrid here. We're talking about a Toyota Prius.

And Just Look At What You Can Get With Your BMW i8

Apparently, Chevrolet Volt battery covers make suitable homes for bats. As part of an Eagle Scout project, Matthew Netherland created 30 bat houses out of scrapped Volt battery covers donated by Chevy. 22 of the bat houses will be set up near hydroelectric dams in Michigan. Each bat house will accommodate 100 bats, and divert the scrapped materials from the landfill. The battery covers also make great nesting boxes for wood ducks, which General Motors has previously set up at its Milford, Michig

Latest Error Was Discovered In March

It's been a rough time for the official fuel economy figures for the Ford C-Max Hybrid. When the car was released in 2012, Ford made a huge deal about how it would beat the Toyota Prius V, which was rated at 42 combined miles per gallon, 44 city and 40 highway. The Ford? 47 mpg across the board.

This is the second time the C-Max hybrid drops its fuel economy numbers

Ford has announced that it will be lowering the fuel economy ratings on a number of its 2013 and 2014 model year vehicles after an error was discovered in the company's internal testing data. The EPA has been notified.

Let math improve your MPG

The next time the hypermiler in front of you stops you from catching that next green light, take heart. One day, it won't be the driver's fault. There will be algorithms involved. But you migh still be aggravated for not making that light.

April Fools! That dip in new-car fuel economy during the fourth month of this year was in fact an aberration. The University of Michigan Transportation Research Institute (UMTRI) calculated the weighted average of new-car fuel economy and determined that new car month-over-month fuel economy in May rose for the fourth time in five months. Better yet, May represented a monthly record high.

But Chevy Discontinuing More Efficient Mild-Hybrid eAssist Model

Chevrolet has announced that it will include stop-start technology as standard in the entry level 2015 Impala. The result is a nearly five-percent improvement in city fuel economy, also known as one mile per gallon, up to 25 mpg, combined.

Keeping up its from-all-angles approach to efficiency, Toyota has found yet another way to eke out up to ten percent more precious MPGs in its hybrid vehicles, this time electronically. The automaker has announced the development of new silicon carbide (SiC) power semiconductors for use in power control units, which it will begin testing on Japanese roads within the next year.

With US gas prices approaching levels likely to give Americans the summertime blues, both automakers and prospective consumers appear to be trying to minimize the damage by driving fleetwide fuel economy up to unprecedented levels. This year will be the first model year ever in which more than half of the new US vehicles sold will get more than 23 miles per gallon, the Consumer Federation of America (CFA) says. And if that number doesn't seem particularly unimpressive, consider that fewer than o

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