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I have a 04'SL and there is no chance this is correct.
Of course, driving style will create a HUGE fluctuation in milage. My IS 250 AWD averages 20-21 mpg, but when I took a trip from Philly to the Jersey Shore this week, and filled up on the way, I was averaging over 30 mpg because the driving was all highway, as opposed to my normal in-town driving.