Yes, especially when it comes to commercial lawns. Fuel capacity can limit how long you can mow for. If you need to mow a large commercial lawn and you have a low fuel capacity riding mower, there is a good chance that you may have to refuel during a mowing session. That is not the end of the world, but it can break up the flow of a job and add more time to it. The larger the capacity, the longer it is until you have to refuel.