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The fan, especially in winter, will probably extract only a negligible amount of power.
First, assuming you've got a fan clutch (standard in our 240's) that's in good condition, the fan is almost always freewheeling -- even though the fan looks like it's being driven by the engine, it's really mostly coasting.
Thus, it only engages if the radiator (and thus the air flowing through it) gets hot for some reason, but if you're driving along, the car's movement is enough to drive air through the radiator and keep it cool (again, assuming winter weather).
When stopped, the radiator may get hot enough so that the clutch engages, but that's about the only time. So how many times, and for how long, do you sit idling? So in summary, its wintertime impact on your gas mileage is probably negligible.
Finally, there are so many variables in trying to measure your gas mileage, those sources of error will probably overwhelm the slight improvement possible from removing your fan.
Likewise, another possible but negligible advantage would be to lessen the load on your water pump's bearing -- it may last a few thousand miles longer :-). Is it worth the trouble?
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