Sneaky Gas Pump Habits That Are Quietly Costing You a Fortune

One of the most common and costly mistakes at the gas pump is topping off your tank. Over-fueling can harm your engine and reduce its performance. Modern gas stations have vapor recovery systems designed to absorb excess gas released when the tank is full, so topping off isn't just unnecessary — it's detrimental.

Gas prices vary throughout the week, typically being cheaper at the beginning of the week and more expensive on weekends, so plan to fuel up early in the week rather than waiting until Friday or Saturday. It also pays to skip the nearest station out of convenience — use gas price apps and websites to find the cheapest gas in your area, and stay aware of price trends so you can plan fuel stops around them.

Despite its higher cost, premium gasoline rarely provides additional benefits for most vehicles. According to the Federal Trade Commission, drivers wasted over $2 billion on premium gasoline in 2015. Stick to regular gasoline unless your car specifically requires premium.

Many major gas chains, such as Circle K, Exxon Mobil, and Shell, offer fuel reward programs that provide discounts and savings — worth joining if you regularly fuel up at the same station. Pair that with a rewards credit card that offers cash back on gas purchases, and apps like GasBuddy, Upside, and Gas Guru that surface discounts and rewards, and the savings add up fast.

Properly inflated tires can significantly improve your gas mileage. While inflating tires at a gas station might cost a small fee, the savings on fuel from better mileage are worth it. Make it a habit to check your tire pressure regularly when you fuel up.

Aggressive driving, like rapid acceleration and braking, can lower your gas mileage by up to 33% on highways and 5% in cities, so maintain a steady speed and anticipate traffic. Idling consumes fuel without getting you anywhere, too — if you expect to be stopped for more than a minute, turn off your engine. Modern vehicles are designed to handle frequent restarts with minimal wear.

Extra weight in your vehicle reduces fuel economy — every 100 pounds of extra weight can reduce your miles per gallon by about 1%, so clear out unnecessary items from your trunk and interior. On the highway, use cruise control to maintain a constant speed and avoid unnecessary acceleration and deceleration.

Combine errands into one trip to reduce the amount of driving you do, and use GPS navigation to find the most efficient routes and avoid traffic. Carpooling with colleagues or using ride-sharing services can also split fuel costs and reduce wear and tear on your vehicle.

Regular maintenance, like oil changes, air filter replacements, and spark plug inspections, keeps your engine running efficiently. A well-maintained engine uses fuel more effectively and reduces emissions — small changes in your fueling routine and driving behavior can add up to significant savings over time.