It's taken a very long time to get here, but the 2012 Ford Edge fitted with the Ecoboost 2.0-liter four-cylinder engine may be worth the wait.

The website FordInsideNews reports that the Ecoboosted Edge will receive EPA gas-mileage ratings of 21 mpg city and 30 mpg highway, for a combined rating that's likely to be around 24 mpg.

Those ratings aren't yet posted on the EPA's FuelEconomy.gov website, but they compare to previous highest ratings for the standard 2011 Edge, fitted with a 3.5-liter V-6 engine , six-speed automatic, and front-wheel-drive, of 19 mpg city and 27 mpg highway, for a combined 22-mpg rating.

Ford Four-Cylinder EcoBoost Engine

Ford Four-Cylinder EcoBoost Engine

The Edge with four-cylinder Ecoboost engine was originally unveiled at the Chicago Auto Show in February 2010. Ford had initially said it would go on sale by the end of last year, but that didn't happen.

The 2.0-liter direct-injected and turbocharged four is likely to be rated at 230 to 240 horsepower. It's mated to Ford's six-speed automatic transmission, and will be available on all trim levels of the 2012 Edge, which include the base SE, the mid-level SEL, and the top-of-the-line Limited.

[UPDATE: On August 2, Ford released official details on the 2012 Edge with Ecoboost. It's rated at 240 horsepower, and includes active grille shutters that close at speed when the engine is sufficiently cooled, to reduce aerodynamic turbulence from air passing through the grille, radiator, and engine compartment and hence improve gas mileage.]

Production of the 2012 Ford Edge will start one week from today; prices haven't yet been released.

[FordInsideNews.com]

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