Two Minivans with some similarities, but otherwise different in most aspects such as the horsepower, ground shadow size, maximum occupancy, starting price, fuel economy, and height. First of all, the 2016 Ram Promaster City is priced $5,530 lower compared to the base MSRP of the 2015 Honda Odyssey. Also, the 2015 Odyssey has a more powerful engine and gets 2 mpg less than the 2016 Promaster City. In addition, comparing the dimensions we see that the Odyssey is significantly larger, although it's slightly shorter than the Promaster City. And finally, you'll seat three more passengers in the Honda Odyssey than in the Ram Promaster City. Among similarities is the body structure.