 Re: Diesel mpg - way of driving?
It's not misleading really. Much like womens' clothes sizes. A 16 is always larger than a 14 in the same shop or range of clothes.
But comparing Next to M&S is largely pointless.
Basically, it's a guide. How do you define the average driver? Or journey?
TO a point though, you're right - they do basically drive in straight lines at very stable speeds to get these numbers.
THe only company that seems able to give a good approximation of its official figures on the road it VW (and other VW brands, Audi, Skoda etc.). | 
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