With Smart Tank Technology by Blue Sky, never run out of propane. The Blue Sky Guarantee. At Blue Sky Propane, we know you have a lot to worry about – meetings, family activities, the in-laws coming to visit, and more. We believe whether or not your propane tank is full shouldn’t be on the list. That’s why we offer the Smart Tank Technology by Blue Sky. This revolutionary technology automatically monitors the level of your existing propane tank and alerts us when it’s time to refill. No more checking the tank. No more calling in orders. No more awkward conversations about why the tank ran out. Blue Sky Propane is the only propane provider in the Hill Country to use Smart Tank Technology which assures that our LP gas customers are NEVER without service due to an empty tank. No other propane provider in the Hill Country area makes this guarantee.