Quote:
Originally Posted by sfax
IMO what people need is a table of factors that you apply to the official combined figure to get something more realistic for each model. I know some websites provide their own mpg figures. I would put the X3 factor at about .87 which is achievable if you drive like Miss Daisy
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It has been reckoned you should knock off about 11%, but now I see 15% being used by some. But that is simply averages across the board. As you say, an adjustment factor for each model/engine combination would be more representative.
I suppose Honest John's site is trying to do that with a percentage ratio. But even that is flawed, as there are variables where consumption revisions occur for that model, and that skews the true average percentage.
HighlandPete