Got a reply...
Hi Rob
The question was set by the DSA as part of the theory test syllabus,
however, it is true that cars burn more fuel when travelling faster,
especially over 50mph. This however is at a constant speed so a car that
drives a mile at 70mph will burn more fuel than a car that travels a mile at
50mph. So technically the question is right - remember the DSA and other
authorities don't like speed.
Best regards
Richard
Might be true for some cars but certainly doesn't seem to be the case for mine. There you go anyway, its a DSA answer. Which I still think is wrong
