So any excess weight (fat asses included) means that your fuel economy gets worse. Here's what you can do to get rid of that excess weight.
A car with that kind of fuel economy isn't going to be a rocket by any means but with the money you save at the pump, who cares! Let's take a.
2018 Nissan Kicks First Drive: Kicking Ass and Taking Sales . fuel economy across the board at 31/36/33 mpg city/highway/combined.