MPG-o-Matic 2010 Subaru Legacy Review Summary: The 2010 Subaru Legacy offers a trio of legendary Boxer engine choices along with Subaru’s renown Symmetrical all-wheel-drive (AWD). The Legacy is an excellent alternative for folks that need the safety and security of AWD to deal with adverse weather conditions, but have no desire to drive a SUV or crossover. Legacy drivers in search of more gusto will likely opt for the 2.5-liter turbo four or 3.6-liter six.