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Theortically it takes so much power to push a car down the road. Hot less dense air with less Oxygen just takes greater volume(larger throttle opening) to make the same amount of power as cold dense air (smaller throttle opening). Fuel remains the same either way.
I think every sensor is a little different and that what will determine if you car will do be more FE with hot or cold air, and every car same make model and year may be different. Buy a new O2 sensor and I'll bet your FE will change. If hot air makes better FE, your engine is running leaner. If your fuel to oxygen ration remains constant the FE will as well.
I think better FE when warm or summer is more a factor of air temperature as it relates to bearings & transmission regardless then engine intake air temp. And don't forget warm dry air is less dense for the car to push through as well, no clue how much though.
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