The data on this page seems to be incorrect. For example, for the longest stretch of no chargers (US route 2 through Montana), it says there are no chargers from the Idaho state line to Tilleman Motors in Havre, MT. But there's a Tesla Supercharger in Kalispell, which US 2 goes through. They have this charging location in their database, so I don't know what mistake they're making in their calculations.[1]

1. https://chargingnear.me/stations/859-w-reserve-dr-kalispell-...