While it is possible to use public transportation to get around Kansas City, a rental car is recommended for a more luxurious experience. This will also allow you to easily travel between locations without having to worry about schedule or cost restrictions. Expect to spend around $50-$100 per day on a car rental and factor in travel time depending on location.
If you have more time, consider visiting the National World War I Museum and Memorial or the Harry S. Truman Presidential Library and Museum. For those with less time, prioritize the must-see locations in the itinerary and adjust accordingly. A good way to save on costs would be to plan visits to restaurants during happy hours or for lunch rather than dinner.