I would leave it alone. It seems that some Mercedes seem to "prefer" having the level between the two lines. I.E. consumption is a little higher when the engine is one the max line.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record