The Gigantic Midwest

Leah wrote: "Nebraska is cool too. It has a lot of fields but we finally found a road-side diner: Penny's rocked. Then we came across the Buffalo Bill Museum: it may have been closed but that didn't stop me from making sure their 'chuck wagon' was fully stocked with Bog Beans."

Lots of clues here, for figuring out the mileage. Was the really the Buffalo Bill Museum, or were they in North Platte, at Fort Cody?