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I apologize for not reading every single post in this thread but from what I have gathered the OP is in western Canada and was using an OTS map? That's a recipe for cracked pistons and ringlands I am afraid. While I can't comment on Mexico, we have the worst gasoline in North America as our 91+ grades are equivalent to California 91 at best. I can attest from personal experience as I got my STI pro-tuned (I was getting too much knock even running Cobb ACN91 maps) for Husky 94 and a co-worker as well as another person I know ran Cobb OTS maps on their STI's. Only my STI stood the test of time as the OTS maps tuned for 91 available in most of the USA will simply not work well when you are fuelling your car with lesser fuel such as the swamp piss they sell us in western Canada.
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