I know of three places in the upper Idaho panhandle.
Sandpoint: Co-op Country Store. Head north out of town to Ponderay, take the first right after the intersection. If you stayed on US95, first right after the overpass.
Bonners Ferry: Dyck's Exxon, on the northbound side of Main St. on the south hill, right at the only stoplight in town. Ethanol-free gas is in a separate pump that requires a fuel card or cash paid inside. Been a few years since I've bought fuel there, may have changed. Also has towing and full service shop. Major repairs, AC, tires, simple maintenance, and exhaust. My preferred shop for things too complicated for me, such as pulling the dash, or welding that doesn't look like it was done by a blindfolded ape.
South Hill Chevron (formally Liberty Fuel), on the southbound side of Main St., one of the first businesses you see when you reach the top of the hill heading south. All premium is ethanol-free. A favorite place for Canadians to fuel up their boats en-route to the three big lakes. Great junk food from the hot case and best beer selection/prices in town too! Full walk-in beer cooler. Single bay repair shop, independent of station owner (he just leases the garage to a local mechanic).