With respect to fuel-efficiency, the 2011 Subaru Forester is about on par with—or within 1 mpg of—the four-wheel-drive versions of its rivals, such as the Honda CR-V or Ford Escape, though the Chevrolet Equinox and Hyundai Tucson, among others, have it beat. Turbo (XT) models get much lower mileage, however.
Thanks to its new engine, which bumps fuel economy up by about a mile per gallon all around, the Forester now gets better mileage than the Impreza, Subaru's compact sedan and hatchback on which the Forester is based.
We recently drove a 2011 model with the new engine and averaged 23 mpg overall in a mix of cold-weather conditions, so its likely you'll be able to meet those figures.
The 2011 Subaru Forester is respectable within its class, but not very green.