I've been running 87 in my 2001 496 Merc since it was new. It has well over 700 hours on it and I have never had any difficulties related to using 87 octane. For the past couple of years I've had to use the ethanol blend required in MA.
What's more, the Tappet Brothers (Click and Clack) from National Public Radio say that in most cases you are wasting your money on higher octane. I submit my experience substantiates that thinking.
Peter
P.S. Speaking of saving money, check this out. I'm not sure how many Stop and Shop supermarkets are in the Lakes Region, though.
http://www.thehulltruth.com/forums/t...09508&posts=10