Also posted in the other thread...
Quote:
Originally Posted by sfax
Note in particular that average speed on extra urban is 39mph and this is all done on a rolling road with a drag coefficient applied to represent wind resistance. The same drag coefficient is applied to all cars as I understand it which, if true, isn't a fair reflection. Its mpg over 200 miles on a motorway at 70mph would be much more meaningful.
Would love to do a real life urban test to compare mpgs but don't know the full schedule
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There is a bit more to it than one drag coefficient, frontal area and other data is calculated into the mix. The actual test procedure is available to read. I've scanned it in the past and probably have it downloaded and backed up somewhere on one of my drives.
The problem with an actual motorway test, you can't repeat it accurately enough. It has to be controllled, hence would have to be in a simulator type environment. Too many variables for an on the road test, if it were to be a benchmark test for comparison.
HighlandPete