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MSE News: Government miles-per-gallon car figures 'unreliable'

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in Motoring
This is the discussion thread for the following MSE News Story:
"Official government fuel figures overstate just how many miles cars can do to the gallon, it has been claimed"
"Official government fuel figures overstate just how many miles cars can do to the gallon, it has been claimed"
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In other news, grass green, sky blue and later, night to follow day.
5t.
Why else was it so important that the govt set about creating the scrappage scheme a few years back?
They are of course idiots anyway, if they think buying a new car can save them money at all.... Even if the old one did 35mpg and the new one 50mpg.
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Although on my commute I do get the manufacturers claimed figure for the combined cycle which is what i would describe my journey as. It all depends on how people drive it should be treated as a potential figure. In reality if you drive the right way you can exceed these manufacturers figures in some cars.
Reality is often around 10% less than the "combined" figure.
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I hypermile to get 30+% more than combined figure for my car.
The secrets behind official mpg v real life mpg
My wifes car persistently hovers around 23mpg and if I take it for a week the average for that fill will be 31-32mpg. Same car, same roads, just different driver.
The manufacturers don't fake the figures (albeit the one production car they test will be in finest fettle), as they aren't so daft as to be officially sanctioned, but real life will always be different.
Nothing like realistic conditions.
that said, Watchdog did a big piece on this a while ago and followed a group of people on an mpg challenge. One chap had actually got more than the official figure from his smart car!
5t.