Spread the Gas Station Virus

• Fill up only early in the morning : that's when the density of the gasoline in the underground (cold) tank is the highest - and you're paying by volume. You want to get the highest MASS for you $$! Get it?
• A good reason never to top-off - there's a return (pink) line back to the underground tank that gets opened if the pressure builds up because your tank is full.. So you're donating gas to the station.. don't!
• Always fill up at the LOW fill rate - you see there are 3 settings. If you fill at the FAST rate, some of the gasoline that gets converted to vapour returns to the station's tank. Really?
• Fill up when your tank is half full - or fuller to minimize the amount of air in your tank - or you make it easier for the gas to evaporate.