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In my personnal experience every time you turn AC on, the fan comes on.
And if you use defrost, AC is activated (cause it dries the air)
I can't remember what you did about using hotter air ?
In the summer where outside temp is way hotter, my car uses much less fuel even compared to winter with long enough trip to have everything at working temperature.
My assumption is that hotter air acts like engine downsizing.
Did you use any fancy oil additives in the gearbox and axles ?
Would you consider removing the shaft to the FWD axle (if it's a 4WD) ?
Did you remove your roof rack and antenna ?
Really, since we can't really do aeromods in europe, I fear your targets look very hard to achieve unless sticking to longer slow trips and using another more suited vehicle for usual locomotion.
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