Doomed from the start. First we have people expecting that they can do more together than apart, usually untrue. Totally untrue if it involves voting...that is, the idea that a community can make a decision and compel its members to go along. Legitimate when arguably the survival of community and members is at stake but not otherwise. Neither fuel economy nor automobile exhaust is a problem at all, in that sense.
Then we have the idea of standards and objectivity, another set of false concepts, more trouble than they are worth.
I doubt it is possible to regularly operate an automobile without obtaining a pretty good idea of its fuel economy. Enough said.
The whole thing just taxes people with better things to spend their money on for something that really does not matter, except maybe to people who believe in such fantasies as nations controlling their fate, governments having wisdom, or that people are too stupid to conserve if they find something to be scarce or expensive and being used wastefully. If it’s cheap and abundant it CAN’T be wasted.