"Chrysler can't seem to make a smooth fuel efficient 4 like Honda and Toyota "
Strange that... with all of M-B resources... why don't they just put the 4 from the M-B C class in the car.
MB sells terrific four bangers, known for being as smooth a six and very economical. But, I wonder about the cost of production. I can't speak to the latest MB fours, but the older iron-block M111 and it's cousins were pretty pricey to build thanks to over-engineering. Forged steel cranks, forged pistons, huge bearings, dual-row timing chains, and so on, made them expensive, even in the large quantities they were produced. Trying to make one inexpensive enough to drop into a $22K Dodge might not be feasible. But, they do have the FWD four cylinder driveline in the B-Class, so they might have brought costs down.