Seattle to Sioux Falls, SD
I will be taking I-90 almost of the way, except for a little diversion just past Billing, Mt. Well really more like a little town called Crow Agency, but who's ever heard of that place, any ways it's ...
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US 212 is a good highway, will be a little slower than I-90 but you will see lots of open country and probably a few antelope too. Gas and diesel is available in Broadus, MT so you don't need to worry about fuel; however fuel is probably cheaper in Billings or Rapid City.
