Supercars might make monster horsepower numbers, but they do so with a monster price tag to match. In response to this, Winding Road has come up with a number called SpD, or ‘Speed per Dollar’, as a way of showing what cars are best at balancing power, weight, and financial outlay. There’s even a calculator that you can use to crunch the numbers for your own vehicle, though unless you own a Mazdaspeed3, I would suggest you don’t get your hopes up.
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