[oil pan 4]

On my suburban when I converted to electric fans I picked up over 1mpg city, 2mpg in combinded and 2mpg all highway driving.
But I was already getting well over 20mpg highway at that point.

I think they do it by not turning when the engine is cold, letting it warm faster. And on my truck as long as I can keep moving faster than 30mph I never need the fan.
The fan requires 0 engine power most of the time.

With the belt driven fan gone I also noticed:
The engine turned over faster.
Started sooner when cold.
Less noise from under the hood, no sound from the fan beating air all the time.
Seemed to have more get up and go off idle.

If you have a big flat grill like me my idea for a grill block for use in cooler months may work for you.
The prototype version will be to install a big thin layer of lexan over the grill with zip ties. I plan on leaving one side slightly open so the transmission cooler can get some air over it and cut away sections till I get just the right air flow.
I may try a summer version that blocks about half or more of the grill off. It will be removed for towing.
I am also going to be running water injection when I put the turbo on, that helps cool these engines down a lot.

I am running file fitted rings on an engine I built to run N/A with 24:1 compression, so over heating on forced induction is not an option.