You guys are probably right. I agree with your comments.

Have you ever thought of using Acetone to improve mileage?
Here are some links:

http://pesn.com/2005/03/17/6900069_Acetone/

http://www.lubedev.com/smartgas/additive.htm

http://peswiki.com/index.php/Directory:Acetone_as_a_Fuel_Additive

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz