The only reason I can think of is that gas is started to drop in price. To ensure that gas prices don't drop that much they are just increasing the quality of gas.
All I can say is, thanks but not thanks. My car isn't worth the value of gas. I did try the better gas and I must admit what a change. There was an instant change in the car itself. Just see for yourself.
87' Gas Quality:

90' Gas Quality:

It's all a farce. I don't the better gas, I want the cheaper gas. Cheaper gas = happier Ilan.