I think a found an error in the MMI that's not in the errata. If you look at the table of overland travel for dragons, the numbers are too high.
For a speed of 200 feet (assuming 400, x2 for hustle)...that's 45.5 mph. But in the book, its listed as 60 mph. Many of the other speeds are wrong as well.
For a speed of 200 feet (assuming 400, x2 for hustle)...that's 45.5 mph. But in the book, its listed as 60 mph. Many of the other speeds are wrong as well.