Those passing through Inverness Park last week may have been surprised to see an empty propane tank shouldering Sir Francis Drake Highway with a sign reading, “De Carli’s: If you respected your customers, you wouldn’t be reading this. Take this away, now.”

The sign was the work of Matt Gallagher, a West Marin native who says he has grown tired of poor service and perpetual administrative blunders by one of the area’s two leading propane…