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[quote]QUOTE: Originally posted by older than dirt Humor me for a minute, OK, if I'm already burning 93 octane gas in my Mustang, I'd suppose going to E-85 should give me quite a horsepower jump, shouldn't it, since it's 103 octane? I get between 21-22 mpg. Would that go down, or stay the same? Would I have to re-re-program my chip too? I don't know much about E-85, and I haven't come across any to try, but from what you guys have said tonight I'd like to try a tank full. If I've gotten too far off topic, I'm sorry, just tell me so, but this is the first really good discussion I've read about different fuels like this. I think this is interesting, 'specially coming from railfans' perspectives! Also, one thing that hasn't been mentioned...Nothing smells better than about 20 sprint cars on a humid Saturday night belching out methanol exhaust! mike [/quote] At the risk of oversimplifyng, you will only see a horsepower gain from a higher octane fuel if you raise the compression ratio of the engine to take advantage of it. The sprint cars you speak of have very high compression ratios (14:1 or so). Your mustang is around 9:1, if it is stock. The UP is a business, if I were a stockholder I would expect sound business decisions, not charity. Besides, they have lots of work hauling asian made goods to Wal-Mart. My apology for getting off topic.
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