I used to put 87 in my old auto gt-s for the longest time. I didn't notice any power difference because there was no power there to begin with. At the time I couldn't justify putting premium in a car that can get beaten by Civics. I finally started putting in 91 when my friends screamed at me. Didn't notice any differences. With my new 6spd gt-s I have never neglected to put premium in.
I don't complain too much about our prices because other countries pay WAY more than we do. Let's face it, the prices will never go back to .79