Premium gasoline is not a boon to fuel economy. Premium is pricey, and it doesn’t even help you save on gas. Using the lowest-grade octane gas allowable, according to your car specifications, is the way to go. Drivers can instead add more liters of lower-octane gas instead of buying the premium and more expensive types.
15. Filling up when the tank is down to a quarter or lower is better.
If gas prices are falling or steady, waiting for as long as possible before refueling will give higher mileage. As gas in the tank is burned, kilometers-per-liter increases as the car becomes lighter. Filling up more frequently equates to a higher average weight for the car and a lower fuel economy in the process. Nonetheless, the caveat is if prices are on the rise, it is more practical to gas up while oil is cheaper.
There you go. By spending less for gas when traveling, not only do you save a sizeable chunk of your budget, you also get to help the environment. Win-win, don’t you think?