Just my $0.02 worth. I work as a tech in a new car dealership. I can't recall any of our vehicles running only 8.5 compression. Most of them are in the 9.5 to 11.5:1 range and recommend 87 octane. These modern engines also put out up to 400+ HP. Even the 4 cyl can get close to 300 HP with the factory turbo. Of course they also use variable valve timing and ignition timing to control detonation. I also remember detonation issues on cars of the mid 70s through the mid to late 80s because they were trying to raise temps and lean out mixtures to reduce emissions. Those things would "ping" with 8:1 compression on 87 octane and put out 110 HP with a 350 V-8. Anyway I'll keep running 87 in my M's since I don't use them that hard anyway and haven't had any problem yet.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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