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The 2008 Ford Escape Hybrid (shown above) is the most fuel efficient SUV sold in the United States, with the front wheel drive version delivering 34 city and 30 highway miles per gallon, while the four wheel drive version hauls down 29 city and 27 highway. The non-hybrid Escape is available with either a 2.4 liter four cylinder or a 3.0 liter six.