Automotive technology has advanced quite a bit since the days of Carl Benz’s Patent Motorwagen and the one-cylinder engine. The Ford L-head T-4 that powered the Model T helped that car bring automobiles to the masses, and automakers worked diligently to refine engine power and efficiency when the Model T went out of production after 1927.  In 1908 — The Model T’s first year of production — the Association of Licensed Automobile Manufacturers developed a formula to calculate engine horsepower,
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