[oldss72]

Just filled up my first tank of 87 octane gas. No Difference that I could notice. I kept a close eye on the temp gauge, and did not see any difference. It has been wicked cold however for quite a while, (highest I have seen in days is 10), but I don't think there will be any difference. I got 21.5 mpg this last tank, although there was some driving though snow, and a few times that I practiced my sliding though corners...lol. Let me know if you need anything else.
Joe