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Old 07-27-2007, 07:56 PM
bobterry99 bobterry99 is offline
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Join Date: May 2001
Location: Las Vegas, Atlanta
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I got around 28 MPG driving through New Mexico at a steady 80 MPH a few years ago. That car was a 300SL with manual transmission.

A check engine light would be caused by a fault in the fuel injection controller. Codes for this are easily read with an LED from Radio Shack.

A lean mixture could be caused by a mass air flow sensor badly adjusted. See Steve Brotherton's article: http://www.peachparts.com/Wikka/EngineControls.

Note that a lean-running engine will generally get worse fuel economy than one that is running correctly when driving on the highway.
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