Tower Station U-Drop Inn Cafe, Shamrock, Texas

Superchargers in parking lot - 50 ft walk.
Rt 66 Museum is open during the day.
If you have a chance go by after dark - the neon on the building is very nice.
Tip: There is a sign by the Superchargers with instructions on where Tesla folks can find the bathroom when the museum is closed.
This is a low budget museum but done well. On our return trip (at night) we left cases of toilet paper, paper towels and some liquid soap to pay forward - it is that kind of friendly place.