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Old 07-15-2014, 11:45 AM
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EPA Asking OEMs to Road Test Cars due to EPA MPG Sticker Not as Advertised

After owing 4 gas trucks / suvs and then 2 diesel grand cherokees I can't agree more. EPA #s are a joke as they are done in a lab on a dyno and more often then not the vehicle was never actually tested but an algorithm was used to calculate EPA mileage. WSJ is finding (finally) that this practice is misleading customers who can't get EPA even when trying to whereas diesels we are finding that we get EPA on average and better.

"The EPA currently requires a five-part lab test that simulates driving under conditions that are repeatable from one car to another. Because of the number of vehicles on the road, the agency runs tests on only about 15% of the industry's models each year to check the accuracy of mileage claims.


In real world use, hybrids for many auto makers tended to underperform the lab results. Meanwhile, diesel engines tend to perform much better than the labelóby almost 5 miles a gallon, according to The Journal's analysis. The spread is so significant that Mr. Grundler has asked engineers to look into why the testing of diesels doesn't reflect real-world results more closely."

Link to article but requires subscription: EPA Wants MPG Claims Road Tested - WSJ
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Old 07-15-2014, 11:52 AM
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Re: EPA Asking OEMs to Road Test Cars due to EPA MPG Sticker Not as Advertised

I don't know if this is still the case since I'm not concerned with mpg. But. I do remember when these EPA numbers were originally put on window stickers there was a disclaimer. It said, basically, that these numbers were only to be used to compare vehicles and were not intended to reflect on road mileage.

If we do away with the EPA (and many other fed agencies) we could avoid all these nanny state problems.


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Old 07-15-2014, 11:53 AM
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Re: EPA Asking OEMs to Road Test Cars due to EPA MPG Sticker Not as Advertised

I was really surprised when I found out a couple of years ago that the vehicles weren't actually tested on a track or other closed circuit.

I agree it is a scam but what do you expect from the Feds....
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Old 07-17-2014, 12:44 PM
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Re: EPA Asking OEMs to Road Test Cars due to EPA MPG Sticker Not as Advertised

Quote:
Originally Posted by jaje View Post
In real world use, hybrids for many auto makers tended to underperform the lab results. Meanwhile, diesel engines tend to perform much better than the labelóby almost 5 miles a gallon, according to The Journal's analysis.
Good article. However with respect to the above, I drive about 50/50 city/highway and I average 25.5 MPG across several tanks, hand-calculated. (actually I drive closer to 90% on the freeway, but around here freeway driving is more analogous to city driving...) So for me the "Combined" rating is pretty accurate.
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