Thread: how to increase gas mileage
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  #13  
Old 03-11-2010, 03:06 PM
apb apb is offline
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Join Date: Mar 2001
Location: Houston, Texas
Posts: 450
Change your O2 sensors... My E420's mileage really dropped before changing them. They go bad long before an CEL comes on.
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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)
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