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Message: [QUOTE="Rich Rohrich, post: 1057185, member: 16241"] If the octane booster or race fuel contains an oxygen bearing component then yes it could. MTBE (Chemical formula = C5H12O) is a common octane boosting fuel additive that can have a profound efffect on the fuel curve when it's mixed at 6 ounces per gallon and up. MTBE sells for upwards of $20 per liter these days so it's unlikely that's what you found in an inexpensive OTC octane booster. Most of the Klotz octane boosters I've seen tend to be aromatic hydrocarbon based (toluene, xylene etc.). These compounds bring no additional oxygen to the party but they can influence the fuel curve.. It's more likely that you had a load of bad fuel or water in the tank, and draining it cleaned things up. The good news is US premium pump fuel will satisfy the factory 95 RON octane requirement. Outside the US they classify fuel by RON number, while in the US we use (RON + MON) / 2 as our pump number. The usual difference between the RON & MON rating is 8 to 10 points (called the fuel's sensitivity). If you do a little simple algebra you can manipulate the pump numbers and see that the 95 RON rating will be satisfied with 93 octane pump fuel. As altitude goes up octane requirment goes down, all else being equal. So you'll usually see lower pump numbers if you buy your pump fuel at higher altitudes but the engine will need less octane so it's a wash. Here is some additional info on octane boosters if you are interested : [url="http://www.dirtrider.net/forums3/showthread.php?t=56918&highlight=octane+booster"]http://www.dirtrider.net/forums3/showthread.php?t=56918&highlight=octane+booster[/url] MTBE - The racers friend :cool: [/QUOTE]

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