Open windows or A/C?

When the weather starts to heat up, do you blast the A/C or do you roll the windows down? Maybe you just sweat it out because you are worried about the effect that either option will have on your gas mileage. You might be able to hold out during the spring, while the temperatures are still manageable, but when summer rolls around you're going to have to deal with the heat one way or another. But which is the better option?
The argument for using air conditioning or dropping your windows usually boils down to fuel economy. People…
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