iirc, there was talk of having such a requirement in Canada, but the dealers said, "look, we're good boys, you don't need to legislate, we'll voluntarily supply all that information."
This was a decade or so ago. Since then, some dealers have become "lazy" and don't post the stickers. Luxury brands are the ones most often guilty of this. Someone asked a BMW dealer why no car had stickers in their showroom and their claim was that is was unnecessary due to consumers being so knowledgeable nowadays.
