Two Minivans, but completely different in all significant aspects: horsepower, ground shadow size, maximum occupancy, model year, starting price, fuel economy, and height. First of all, there is a notable difference in the starting price of the 2016 Ram Promaster City, which is $5,380 less than the base MSRP of the 2014 Honda Odyssey, which is two model years older. Also, the 2014 Odyssey has bigger and thirstier engine; the 2016 Promaster City gets 2 more mpg. In addition, comparing the dimensions we see that the Odyssey is significantly larger, although it's slightly shorter than the Promaster City. And finally, there is a difference in the number of passengers; the Honda Odyssey seats three more the Ram Promaster City. Among similarities is the body structure.