These two Mercedes-Benz E-Class models are two modifications of the same model with one major difference, the powertrain. First of all, the 2014 E-Class Sedan has a more powerful engine than the 2016 E-Class Sedan Diesel, and it gets 9.5 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.