As you know gasoline expands and contracts volumetrically with the temperature. The state "seals" of approval only account by testing the volume at the time (and temperature) that they do this. You get a more dense mix of molecules (higher concentrations per volume unit) at colder temperatures than you do at warmer temperatures.
I was wondering if you get more bang for you buck if you are always filling up earlier in the day instead of when it is warmer? If so, anybody know by how much?
Also, are the electronics in the car adjusting the mixture for the denser mix of gas at lower temperatures -vs- higher temperatures?