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Interesting, I didn't know it wasn't just a function of a straight multiplication of the size. There must be a precise formula based on wind tunnel results. It also may be completely dependent on speeds. What's good for a jet at 600 mph is not necessarily the best for a car at 60 mph. It's hard to argue with the 250 mpg results of the XL1. That just plain blows away any other production car ever.
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