Originally Posted by freecia

+ 3 & 4 - If you are considering long distance driving cost performance, also check the highway tolls and gas costs. https://www.japan-guide.com/e/e2354.html has a chart for approximate tolls and there's ways to lookup current tolls based on route. Take the highway and do not opt for local roads to save on tolls. The added stress & increased drive duration is not a good trade off unless you have sufficient time, no need to accommodate kid bladders, and need to be frugal. There are youtube videos showing Tokyo - Osaka route via freeway but in short, the toll roads are well maintained and there's highway rest stops (aka roadside stations) with gas stations, electric car chargers, restrooms and food options. Some are themed quite nicely and fun for kids.