Operating your propane grill without a tank gauge is like driving your car without a gas gauge — when the fuel runs out unexpectedly, there’s a good chance you’ll be in a less-than-ideal situation.

It's finally summer, which means it's time to break out the grill, give it a thorough cleaning, slap some patties on it, and have your first backyard cookout of the year. But how do you know how much ...