Now all know why you got the title below your user name. Both the 500+hp Hemi and the Hurricane turbo require 91 octane fuel, yet you blather on about 87 octane and wonder what the benefit is.

You don't even know the parameters of the question, much less capable of understanding the answer.

as said, Corporate Average Fuel Economy.
plus, any that don't meet some standards, are rewarded by the new owners paying a "gas guzzler" tax upon purchase.

I am not surprised that you bring up the coward mod that uses his own special powers to troll and snipe in safety.

I made a comparison of the merits made in the article. You choose to ignore those and go off on a tangent about octane or some such nonsense. As usual, you are just being a troll with nothing of merit to contribute. All you can do is bash and complain. You can bring nothing of consequence to the conversation. But that in not your mission. Your mission is to be a TROLL. And you are very good at that.

Say hi to your troll mod butt buddy for me.