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There are actually two completely different situations in which the car will run at a steady 225F: 1) Idling in rush hour traffic, and 2) On the highway traveling at 60 mph. My C6 transmission coupled with 3.73 rear end gears causes the engine to run at pretty high rpm, so it generates a lot of heat.

The "sweet spot" for my car (where it locks in at 210F) is 25 mph to 40 mph.

I agree that a puller fan is more efficient than a pusher fan, however, if I'm going to "stack" radiators (one in front of the other), I won't be able to fit a puller fan between them. So, I'll be running one puller fan and one pusher fan.