When it's pizza night, what size do you order? A recent study suggests that you should always order the largest size -- it's usually the most economical. First of all, I always do. Second of all, I can't not believe they spent money on this study! Everyone knows that even if you order too much pizza, it's always good the next day -- and it's great cold! Cold pizza, by the way, is the best cure ever for a hangover ... besides yesterday's tacos.

NPR reporter Quoctrung Bui did the math so we didn't have to-- he checked 74,476 pizza prices from 3,678 pizza restaurants nationwide to find out how the price of pizza changes with the size of the pie. His conclusion: Always buy the biggest pizza.

So what size pizza do you usually order? Take the poll and let us know!

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