When it comes to hybrids, there’s one number that car buyers most want to know: Fuel economy rating. Cars.com reviewer Mike Hanley says that, in this regard, the 2010 Mercury Milan Hybrid is a hit. How much of a hit? Watch his video review to find out how many miles the Milan coaxes out of a gallon of gas, and also how the car stacks up against its sibling, the Ford Fusion Hybrid.