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2010 2011 BMW 5 Series Forum F10 Very Poor Fuel Economy in Recent Months |
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03-17-2014, 06:54 PM | #45 | |
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For all the engineers out there who complain about the methodology; I bet at the end of my test, my numbers will more closely approximate what the actual average fuel consumption of the car is likely to be than any government test the auto manufacturers (yes you read that right, the auto manufacturers) can come up with. I'd bet money on it!
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03-18-2014, 08:16 AM | #46 | |
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Where I have a problem, the current NEDC test (for Europe) is not representative of real world driving. Set up tests which truly reflect what is achieved on the road, (from average data) there should be close to parallel results, if the official tests are not skewed by error, or by some external interest or bias. So easy to optimise a test over time, rather than be seeing true averages. For example, it is known for the NEDC test that the road load figure which gets used for the dyno test, is now questioned for integrity, as it is not reflective of independent tests. Clearly the existing data is favoured by the manufacturers as it is biased towards good results. None of this helps the user who often sees poor consumption, compared to expectations. HighlandPete |
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03-18-2014, 11:40 AM | #47 | |
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There is allot at stake for manufacturers. Kia recently had to settle a class action suit for putting up consumption figures that were 20% lower than actual. The smaller car companies may not have the capital (or want to commit the capital) to invest in technologies that will reduce fuel consumption. But they have to sell cars, so Kia took a chance and got caught. All the car manufacturers benefit from test rules that show unrealistically high fuel economy. If it was that difficult to devise an accurate test, don't you think there would be some cars that got better mileage in the real world than the government fuel economy ratings? Its curious that all of the cars do poorer on the road than in testing (and never the other way around).
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