Do you get better gas mileage on very hot days or very cold days?
603680
THEORETICALLY, you'll get better gas mileage on cold days because you're ramming more air into the engine.  And the TIRES (the biggest waste of energy is heating up the tires instead of pushing the car forward) are going to run cooler, too.  \n\nThe heater steals less energy from the engine than an airconditioner, too, another plus for cold days.\n\nIf you have that sensor that adds gas on cold days, it depends on how much gas it adds during cold weather.
243090
Hotter summers and colder winters short on both
334098
Hot air *can* contain more moisture than cold air, but it depends on how much moisture is available for it to contain.
622041
In engines, there is a very, very small space between moving parts when it is cold.  After the engine heats up the metals expand and things fit more properly.  This is also true of your car.  That is why it is not good to drive a car at higher revs without the engine being warmed up.
425553
I agree. The one when youre not involved. It's more hotter for many reasons.
861148
I think it will be in the cold weather, because the system will burn more calories to keep the heat of your body.
1055213
Cold, It's easier and maybe nicer to warm up than it is to cool down
26224
I love the cold. In the cold it's simpler to just put on the heat when your cold. but its harder to chill the heat
672239
because extreme heat is better than cold.
72195
No.  That would actually cause you to burn less calories.  When you're cold, your body burns energy to heat you up to 37C.  When you're hot, your body has to work less to heat you to that level so you burn less calories.
536295
I have certainly gone through a few 'dry spells' although I wouldn't say I got 'frigid'. I have absolutely gotten the 'cold shoulder' and many times have been 'frozen out' of a situation. Hmm...HEAT? Certainly I've a gone through a 'thaw' or two, enjoyed the 'warmth' of spring and I have been know to 'fire up the furnace' and 'stoke the engines' and 'set the place ablaze' on occasion.
1098919
The air temperature has less to do with calorie burning than muscle fatigue.  If it is too cool, you run the risk of damaging muscles.  That's why you stretch and warm up first..to loosen them.
233121
Liquid fuel does not burn, only vaporized fuel burns.  The job of the engine is to turn liquid fuel to a vapor and bring it to its auto ignition point.  A cold engine is inefficient in vaporizing fuel due to the low temperature of intake ports and combustion chamber.  In order to achieve the minimum level of vaporized fuel in the combustion chamber to keep the engine running, more fuel must be delivered.  Therefore, cold engines require rich air/fuel mixtures.  FYI.  Cold engines also require higher idle speeds to evercome increased internal resistances.  Many parts, but particularly the pistons and cylinders are not at their normal shape when the engine is cold.  Engine pistons are "cam ground" meaning they're somewhat oblong so that when they reach normal/operating temperature, they will end up round.  Since they're not perfectly round and don't perfectly match the shape of the cylinder, there is more internal resistance.  Vehicle engines are therefore designed to provide a high idle when the engine is cold.
569589
I guess it can be done, but since your car isn't as well-insulated as your freezer, you'll need to change your AC and use a lot of power in order to do it. More power means a larger engine (more expensive) and more gas consumed (MORE expensive). You can also try buying a refrigerated truck and hanging out at the back.
847803
You have a truck that gets 13 mpg, my F-350 duelly only gets about 9.  Which reminds me, it is that time of the month and I have to run all my generators for an hour to keep the gas lines from clogging up.
1047022
Depends.\nIf its hot outside- I want a cold pool\nIf its cold outside- I want a nice heated one.
89822
It helps, but air temperature and density is what makes the biggest difference. Cold, thick air makes the most power.