How to Save Money on Gas

Who doesn’t want to save money on gas these days. While the prices at the pump aren’t at historic highs —and boy are we thankful for that — they are still pretty high.

For example, it used to cost between $30 and $40 to fill the tank of our Subaru. Now? It’s $50 to $60. It’s been a long time since we saw gas under $2. But there are ways you can keep your gas spending to a reasonable amount.

Easy ways to save money on gas

In addition to shopping around for the best prices on gas, there are other ways you can save money on your fuel costs. I’ve outlined some easy and fast ways to get this done.

Change your engine air filter regularly

An air filter is essentially your vehicle’s lung. A clean air filter helps the engine “breathe” and run more efficiently. On the other hand, a clogged air filter makes the engine work harder.

According to the Federal Government, replacing a clogged air filter can improve your car’s gas mileage by as much as 10%.

Keep tires inflated and in good condition

This tip to help you save money on gas is also one that applies to car care. That is, you need to make sure your tires remain in good condition.

One, it makes your driving experience more pleasant and safe.

Two, under inflated tires can be gas bandits. That is, they create extra friction where the rubber meets the road and decrease your fuel efficiency.

Three, incorrectly inflated tires also wear unevenly. This is a problem because it can cause a blowout. Or, it might mean you have to replace your tires more often, and tires are not cheap.

Where to find your car’s tire pressure information

You can find your vehicle’s recommended tire pressure information in the vehicle owner’s manual. Additionally, you’ll find these numbers on the inside of the driver’s side door. Here’s a picture from the inside of the driver’s-size door of my Subaru Forester:

It’s important to note that the tire pressure number for front tires is often different than the back tires. This is especially true with all-wheel drive cars.

Use vehicle-recommended grade motor oil

Motor oil lubricates the engine, keeping it cool and reducing friction between moving parts. As the motor oil circulates, it also cleans away harmful dirt and contaminants. Using your vehicle owner’s manual recommended grade oil can improve your gas mileage up to 2%.

Also, it goes without saying that you should stay up to date on oil changes. This is good advice for the overall health of your car’s engine.

Save money on gas by lightening your load

Are you driving around with bags of clothes you want to consign? Or boxes of items you’re hoping to donate to Goodwill? Or, like me, bags of wood pellets you got from a home improvement store in your car’s trunk and have been too lazy to bring inside?

All of this extra weight in your car can sink how efficiently your car uses gas. So, you’ll end up filling your car up with gas more often rather than saving money by skipping the gas station for longer periods of time. and it bears repeating again here.

Bottom line: leave unnecessary items at home before setting out on a drive. Or, note to self, take in heavy purchases as soon as you get home.

Make sure your gas cap fits tightly

Today’s smart car computers will often give an alert when your gas cap is too loose. However, if you’re driving an older car, you may not know if the cap is loose.

Here’s why you want to always make sure your gas cap has closed properly: driving around with a loose gas cap can cause you to “waste” up to three gallons of gas each month or about 30 gallons over a year.

That’s money you could have saved on gas that is escaping through that gas cap. Also, on newer model cars, a loose gas cap can trigger a “Check Engine” warning. This has happened many times with our Subaru cars.

So, what happens when you get that “Check Engine” light? Well, don’t be like Penny in “The Big Bag Theory” and ignore it.

You take your car in for service. And service is never free, right, meaning you’ll spend more money at the mechanic to fix a problem you could have avoided by making sure your gas cap is tight.

Drive more evenly to improve gas mileage

If you can avoid the rapid acceleration and quick braking that is aggressive driving’s calling card, you will improve your gas mileage.

But if you stay all hot-and-bothered behind the wheel, you can expect to lower your gas mileage by as much as 5% for around-town driving.

Fill up at gas stations that give you a break

Right now, we do much of our local grocery shopping at Giant Eagle supermarkets in Western Pennsylvania. We also get our prescriptions at the Giant Eagle pharmacy in town. In addition, Giant Eagle owns Get Go gas stations.

By being in the Giant Eagle rewards program, we earn points towards money off gas for every shopping trip or prescription we pick up. Recently, I was able to cash in $8 in rewards to shave that amount off filling my tank.

Here’s what you need to know about saving money at Costco gas stations.

Use a credit card that rewards you for filling up

Like many Americans, we have multiple credit cards in our wallets. And which one we use when we need gas depends on different promotions.

For example, from time to time during the year, the Discover Card will offer an extra cash back bonus if you use Discover at the pump. At one point last year, there was a three-month span where we could earn 5% cash back for gas. There was a max $1,500 you could earn during that period.

Also, if you have a Costco membership and the Costco VISA card, you earn a higher cash-back amount when you use that card for Costco purchases. Costco gas stations count.

This is the current promotion for cash back rewards on gas purchases:

“Earn 4% on eligible gas and EV charging with the Costco Anywhere Visa® card for the first $7,000 per year and then 1% thereafter.”

I’m told that some of the gas station brands that qualify for extra cash back include Chevron, Exxon and Shell.

Saving money on gas at Costco

Warehouse and wholesale clubs like Costco and Sam’s Club give members a discount on filling up. Recently, we filled up at a local Cumberland Farms gas station in Maine for $3.07 a gallon. If we drove 10 minutes up the road to the Costco in Maine, we could have gotten gas for $2.99 per gallon.

You’ll need to scan your membership card at the gas pump to get this discount. Which is why if you live near and shop at Costco, it makes sense to sign up for a membership through the Groupon deal below.

Costco Membership Deal via Groupon

The best deal on a Costco Membership right now is through Groupon. When you sign up, you’ll get your one-year membership plus a $50 Costco Digital Shop Card for free. In case you didn’t know, the Costco Shop Card is the store’s gift card. You can use it in store or online.

This offer is for new Costco memberships only or for former Costco members whose membership expired more than 18 months ago. So, if you’ve moved, there wasn’t a Costco nearby and you let your membership lapse for more than 18 months, you’re good to go to sign up for this deal again!

Also, you can avoid the lines at your Costco location by signing up for this Groupon Costco deal. This was the crowd at the new Costco in Maine near where I live. Yikes!

Terms & Conditions

• Voucher will be redeemed, and 1-year membership period will begin immediately upon purchase of the voucher.
• To qualify, you must purchase this promotion by October 24, 2025.
• The $100 off $200 Costco.com incentive will be emailed to the email address provided within 2 weeks after successful sign-up. The incentive expires November 9, 2025.
• Limit 1 Groupon voucher per person. Valid in the U.S. only. All sales final.
• Valid only for new members and those whose previous memberships (Primary and Household) have been expired for at least 18 months.
• Not valid for upgrade or renewal of an existing membership. Promotion may not be combined with any other promotion. To purchase this package, you must be 18 years of age or over.
• Costco is not liable for incentives not received due to entry of an invalid address during sign-up.
• Photo identification required when you visit the warehouse to pick up your membership card.
• Costco accepts all Visa® cards, as well as cash, checks, debit/ATM cards, and Costco Shop Cards.
• Annual 2% Reward – Terms, conditions and exclusions apply. See Costco.com or the membership counter for details.
• As part of the checkout process you will be asked for certain personal information that will be transferred to Costco to enable them to issue you a membership number.
• $100 off a Costco.com order of $200 or more. The promo code is only valid on Costco.com , not at Costco warehouses. One promo code per new member. The promo code is valid through Nov. 9, 2025. Ineligible purchases include new Costco memberships, Costco membership renewals, Gift of Membership, Costco Shop Cards, retail gift cards, custom installation services and Same-Day Grocery Delivery. Promo code will not be replaced if lost or stolen. Promo code amount will not be reissued if merchandise is returned. Code restrictions apply. Not valid for orders at online Costco Pharmacy, Costco Travel, Costco Next or Costco Business Delivery. The merchandise total in your cart must equal $200 or more before tax and shipping to receive the $100 off. The promo code must be entered in the promo code box at checkout to be valid.

Again, this a Groupon-only deal for a Costco membership.

Other warehouse club memberships

Perhaps you prefer to shop at another warehouse club because it is more convenient to where you live than Costco is. Good news: Both BJs and Sam’s Club have Groupon deals right now for memberships. Plus, both tend to have gas stations where members can get a cheaper price when filling up the gas tank.