The four do not include the 2012 Subaru Impreza, above, which is due on sale before the end of the year. High-powered WRX and STI models also are coming to the Impreza, Masuda said. The goal is for the top-of-the-line Impreza to get a Boxer engine rated at 300 horsepower.

Overall, Subaru wants to raise fuel economy by 30% for each of its subsequent models. The Impreza will be the most fuel-efficient all-wheel-drive car sold in the U.S. when it hits dealerships, achieving a 27 city/36 highway mpg rating. Subaru will reach the new fuel-economy targets with two new engines — a 2.0-liter and 2.5-liter boxer four-cylinder — that make their debuts in the 2012 Impreza and 2012 Forester, respectively. Also part of the package is a new continuously variable automatic transmission being used first on the 2012 Impreza, too.

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