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A car would not run at all in a vacuum. Gasoline needs oxygen to burn. Assuming that the engine was given enough oxygen to burn its fuel but was otherwise still in a vacuum, yes. There would be no wind resistance to slow it down. No. The Internal Combustion Engine that powers cars needs air (specifically oxygen) in order to run. Without air, then the fuel cannot combust and the engine will not run.

However, just for the sake of discussion let's assume the car has an onboard air supply with which to fuel the engine. In that case, the answer would be yes, cars would get excellent gas mileage in a vacuum. Normally, when a car is moving forward it has to push the air in front of it out of the way. The energy required to push the air has to come from the car. Energy spent pushing air obviously cannot be used to power the car. Therefore if you remove the air by placing the car in a vacuum, then the energy that would normally have been wasted pushing air out of the way can be used instead to power the car. That is assuming, of course, that the car has a supply of air for use in the engine's combustion process, as noted above.

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Q: Would a car get better gas mileage in a vacuum?
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