How Long Does a 500-Gallon Propane Tank Last? Buying a new 500-Gallon Propane Tank is a sizable investment, but one that can save you time and money in the long run. Whether you’re looking to replace a 500-Gallon Tank, buy a new one, or just wondering how long 500 gallons of propane fuel will last, … Continue reading How Long Does a 500-Gallon Propane Tank Last?