Re: Interesting justification.
In what way is idling not part of normal driving? In the city, that's what cars are doing much of the time.
It accounts for a tiny percentage of fuel consumption, so having a fuel consumption test which includes it is not especially useful.
Imposing standardised tests is rather more useful than non-standardised tests
True, but the problem is that politicians care more about being able to say they standardized something than about whether the standard is actually a practical or useful one. A meaningless standard is still meaningless, standard or not. cf straight bananas, etc.