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first off, click on the "65+ Efficiency Mods" at the top of the page and spend time reading through them, might find some new ideas, or at least the logic behind them.
i thought the overcooling thing was about having more air flow over the radiator than needed, not the actual coolant temp which would be controlled by the thermostat. on most stock vehicles in most conditions there is much more air flow to the radiator than needed to keep the vehicle running at the temp regulated by the thermostat. so grill openings, or part of openings can be covered to make the car more aero without making it run hotter.
if your cold air intake is working properly and your getting that extra oxygen, anything with an oxygen sensor will adjust the fuel mixture. now you can make more power for any given throttle opening. sweet right? but it still takes the same amount of power to hold your car at any given speed going down the road, so you dont need to use as much throttle. this car has to be efficient now right? well wait, closed the throttle more...crap thats where the oxygen gets in.... what were we trying to do again?
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