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I have an 2004 SL purchased new in Aug. 04. I've been using 89 from the start and have averaged 18.5 mpg after 5800 (mostly town) miles according to the computer. I have a fairly aggressive driving style, so I'm not surprised I'm below the 20 mpg average, but I definitely feel the 89 octane fuel is the way to go long-term.
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