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my 1983 300se diesel has suddenly decreased in mpg. Runs fine, just using way more fuel. Where should I start to solve this problem. It is my daily driver.decreased
 

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2008 E320 Bluetec, 1988 560SL totalled unto death). 1997 Dodge Ram 1500, 1983 300CD
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You don't say how big the difference is. It is true that oil and Diesel fuel thicken. If the difference is suddenly large, like 10% or more, start looking for a fuel leak.
 

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1984 300D
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You won’t get the same miles per gallon out of winter diesel fuel.
Winter temps takes more heat energy away from combustion making less power available at the wheels.
 
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