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I think it's a compromise between the electric fan and the grill block. If you leave the grill in OEM condition then sure you only use the electric fan on the 95 degree day in trafic with the A/C on. If you block 90% of the grill then you run the fan full time after warm up on a 70 degree day. So find the engineering sweet spot. Cover enough grill to decrease you Cd (improve your aero) but not so much that your running the fan all the time and converting all the fuel you saved in aero into electrical energy to run the fan.
I put the LED on the dash to see when fan runs to get a good idea. An 80 degree day at 50 mph with 80% grill coverage causes the fan to run abot 40-50% of the time. Still leaves me a little margin for the 95 degree day and probably really improves my warmup time on my short commutes. Just another thing to trade off in the hunt for mpgs.
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