What we have here are two Sedans from BMW with some differences, such as the model year, powertrain, market segment, starting price, horsepower, and fuel economy. First of all, there is an $8,000 difference in the base MSRP. The 2013 BMW 3 Series Sedan Hybrid, an older vehicle by three model years, has a higher starting price than the 2016 BMW 4 Series Gran Coupe. Also, a bigger engine usually means less mpg. But the 2013 3 Series Sedan Hybrid has a more powerful engine and it gets 3 more mpg than the 2016 4 Series Gran Coupe. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.