AC or Windows Down? Which One Is Better for Fuel Economy?

It has been stifling hot this summer (thanks, Global Warming) even in our usually temperate climate of Vancouver.  We’ve been hitting 30+ degrees Celsius regularly (about 86+ degrees Farenheit for youngandthrifty’s USA friends).  My boyfriend and I are known to be really cheap when it comes to turning on the air conditioning, but in this hot hot heat, we’ve been less stingy and have been closing the windows and pressing that button and turning on the glorious A/C.

Because of this hot heat, and possibly because I was rendered delirious from the heat, it got me wondering, which one IS cheaper for fuel economy? Air conditioning or having the windows down?  Which one will help that tank of gas (running at $1.18/L again here in Vancouver) go that extra mile for you?

There are two camps to this often heated and long drawn debate, probably not dissimilar to the pronouncement of tomato.  To-MAY-to or To-MAH-to. =)  That is the question.

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