The only thing I'd question about such a regulation is it's effectiveness. The segment where such warnings would have the greatest impact is the one that's already (generally) voluntarily promoting these numbers anyway; the economy market is all about fuel efficiency, and it's mostly people looking for economy who are likely to take fuel efficiency into consideration. People who buy trucks typically value cargo capacity, towing capacity and sometimes just sheer size over efficiency. People who buy sports cars value speed over efficiency. People who buy luxury cars... well, you get the idea. The point is that if someone is spending ~$40 000 or more on a car then there's a much smaller chance that they're going to care, and cars below that price point often advertise these numbers anyway.
The image in the OP is especially ironic. That's a Bugatti Veyron pictured, and Bugatti doesn't advertise through traditional means because it's not efficient for them; a print ad is useless when few to none of the people seeing it can afford the product. Therefore Bugatti would be pretty much entirely unaffected by such legislation.
If you can afford a Veyron you can afford the fuel, and if you're actually buying one you probably you clearly don't care.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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