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Re: gas guzzling
My 1990 300E M103.983 gets between 24 to 27 MPG. 1:3.07 rear end
My 1992 300CE M104.890 gets between 23 to 26 MPG. 1:3.27 rear end (ASR)
These numbers are for freeway driving under various conditions; usually mountainous and high speed. I suspect that the lower MPG of the M104 CIS-E is primarily due to the rear end gear ratio.
I would also suspect that an M104.992 HFM-SFI would get much better mileage due to the fact that they usually had a 1:2.65 rear end ratio. I seem to recall my friend with this engine gets in the 30 MPG area.
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