Fuel economy in automobiles, refers to the fuel efficiency relationship between distance traveled by an automobile and the amount of fuel consumed.
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3B2 — The 3B20, found in the 2003 Mitsubishi i, uses a 660 cc DOHC with the company's MIVEC variable valve timing and an intercooled turbocharger, and was designed with the aim of exceeding Japan's 2010 fuel economy requirements.