This is a fairly contentious argument that's been floating around for years (and basically unprovable one way or the other, kind of like "this is the best oil and filter to use"). I tend to be ambivalent about it, but I would add that (against my advice) my wife put 238K miles on her 07 Acura TSX (91 octane recommended) using off brand 87 octane gas. The plugs were like new when I changed them at 100K and 200K miles, and it still ran like new when I finally sold about 2 years ago. They were all highway miles, but go figure . . .
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