find getting 47 mpg elusive

find getting 47 mpg elusive

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With the recent announcement that Hyundai and Kia will have to restate mileage claims on 1.1 million vehicles in the U.S. and Canada, plus the advent of advanced-drive vehicles, the EPA finds itself having to reconsider its fuel-efficiency tests.

Most vehicles' real-world gas mileage is less than the EPA sticker number and can often be 20 percent less than the sticker number depending on speed, temperature and other factors.

With hybrids, however, the gap is wider — as high as a 30 percent drop, the EPA says. And as the fuel efficiency of hybrids continues to climb, the gap widens further between EPA figures and real-world fuel efficiency.

Consumer Reports says Toyota Motor Corp.'s Prius falls short of mileage expectations by 6 mpg and the Prius c Two falls short of mileage expectations by 7 mpg.

"The only thing the EPA numbers are good for — especially with hybrids — is that they give you a basis of comparison," said John O'Dell, senior editor and green car editor at Edmunds.com. "As the mileage numbers get higher, the disparity with the EPA numbers seems to get higher. The mileage numbers are the results of an intentional effort by the automakers to do as best as humanly possible on the EPA test."

The C-Max can travel at a top speed of 62 miles per hour in electric-only mode. Above 62 miles per hour, the car's four-cylinder gasoline engine starts and helps to recharge the battery like Sony PCG-591L Ac Adapter, Sony PCG-661L Ac Adapter, Sony PCG-691L Ac Adapter, Sony PCG-705 Ac Adapter, Sony PCG-C1F Ac Adapter, Sony PCG-C1MW Ac Adapter, Sony PCG-FR55E Ac Adapter, Sony PCG-FX Ac Adapter, Sony PCG-FX55 Ac Adapter, Sony PCG-GR150 Ac Adapter, Sony PCG-GR250 Ac Adapter, Sony PCG-GR290 Ac Adapter.

That top electric-only speed means that for the portion of the EPA's highway fuel-efficiency test, which maxes out at 60 miles per hour, the car can travel in electric-only mode without the gasoline engine kicking on.

"It's manufacturer-specific," the EPA's Wehrly said. "If they can make their conventional hybrid perform in a manner that over our test cycles reduces the time the engine comes on, then yeah, then they are going to get higher fuel efficiency."

In large portions of the United States, the EPA testing protocols deviate far from real-world driving scenarios: At 60 miles per hour, the speed is approximately 10 miles per hour below most highway speed limits in Metro Detroit (and most Midwestern cities), but is more indicative of the often-gridlocked and much slower highways in California.

For drivers in Middle America who regularly drive faster than 62 miles per hour, the benefits of a hybrid vehicle are diminished.

"All else being equal, it may not make a lot of economic sense for Midwest drivers to buy hybrids," Edmunds.com's O'Dell said.

Ford admits that speed is one of the biggest factors when it comes to fuel-economy fluctuations, but said customer reaction to the vehicle has been overwhelmingly positive.

"Speed is the No. 1 factor," Sherwood said in an interview earlier this week. "Particularly if you're going above 70 miles per hour… that makes a major difference."