With gas prices always seeming to fluctuate, getting the most out of every tank of fuel matters more than ever. Whether you’re commuting across the West Seattle Bridge, running errands in The Junction, or heading down to Alki for a sunny afternoon, better gas mileage means less need for auto repair, fewer trips to the pump and more money staying in your pocket.

The good news is that improving your fuel economy usually doesn’t require buying a new car. In many cases, it’s the result of taking care of the one you already have.

At Tom’s Automotive Service, we’ve been helping West Seattle drivers keep their vehicles dependable since 1971. One of the most common questions we hear is, “Why am I filling up so often?” More often than not, the answer comes down to routine maintenance. A few small issues can quietly rob your vehicle of fuel efficiency, but catching them early can make a noticeable difference in both performance and operating costs.

If you’ve noticed your miles per gallon dropping, here’s what may be happening—and what you can do about it.

Why Is Fuel Economy Dropping and Costing You More at the Pump?

If your vehicle isn’t getting the gas mileage it used to, don’t assume it’s simply because fuel prices have gone up. Your car may be telling you that something needs attention.

Modern engines are designed to run efficiently when everything is working together properly. Clean air, the right amount of fuel, healthy ignition components, and proper tire pressure all play an important role. When even one of those systems isn’t performing as it should, your engine has to work harder—and that usually means burning more gas.

The change often happens gradually. You may not notice your fuel economy slipping until you realize you’re filling up a day or two earlier than usual each week. That’s why it’s important to pay attention to small changes in how your vehicle drives.

Some of the most common causes of poor fuel economy include:

• Dirty or clogged air filters
• Worn spark plugs
• Low tire pressure
• Old engine oil
• A failing oxygen sensor
• Wheels that are out of alignment
• A Check Engine light that’s been ignored

None of these problems necessarily mean you have a major repair ahead of you. In fact, many are inexpensive maintenance items that can quickly restore lost fuel economy when addressed early.

We’ve seen plenty of vehicles come into our shop with complaints about poor gas mileage, only to discover that a simple maintenance service solved the problem. Waiting too long, on the other hand, can allow a small issue to create unnecessary wear on other parts of the vehicle.

That’s one reason regular inspections are so valuable. Instead of guessing why your vehicle is using more fuel, we can pinpoint the cause and recommend only the services your vehicle actually needs.

What Maintenance Services Can Help Improve Your Vehicle’s MPG?

If you’re looking for the biggest return on your maintenance dollars, start with the basics. Routine maintenance doesn’t just help your vehicle last longer—it also helps it run more efficiently every day.

Here are a few services that have the biggest impact on fuel economy.

Replace Dirty Air Filters

Your engine needs a steady supply of clean air to burn fuel efficiently. When the air filter becomes clogged with dirt and debris, airflow is restricted. That forces the engine to work harder and can reduce both performance and fuel economy.

Replacing an air filter is a simple service, but it’s one that many drivers forget about. Here at Tom’s Automotive, we’d love to “clear the air” for you and your vehicle. Contact us today!

Keep Spark Plugs in Good Condition

Spark plugs ignite the air-and-fuel mixture inside your engine. As they wear, combustion becomes less efficient, which means your engine may use more fuel to produce the same amount of power.

If your vehicle hesitates when accelerating, idles roughly, or simply isn’t getting the mileage it once did, worn spark plugs could be part of the problem.

Check Tire Pressure Regularly

This is one of the easiest ways to improve fuel economy.

Underinflated tires create more rolling resistance, forcing your engine to use extra fuel just to keep the vehicle moving. Checking your tire pressure once a month—and before long road trips—can help improve mileage while also extending tire life.

Don’t Ignore Wheel Alignment

If your steering wheel isn’t centered or your vehicle drifts to one side, it may be time for an alignment.

Misaligned wheels create additional drag and uneven tire wear, both of which reduce efficiency. Proper alignment helps your vehicle roll more smoothly while improving handling and helping your tires last longer.

Stay Current on Oil Changes

Fresh engine oil reduces friction between moving engine components. As oil ages, it becomes less effective at lubricating those parts, forcing the engine to work a little harder every time you drive.

Routine oil changes help your engine operate more efficiently while protecting it from unnecessary wear.

Pay Attention to the Check Engine Light

A Check Engine light doesn’t always indicate a major repair, but it should never be ignored.

Sometimes something as simple as a failing oxygen sensor can cause your engine to use significantly more fuel without creating obvious drivability problems. A diagnostic inspection can identify the issue before it affects your wallet even more.

Small Services Add Up

Many drivers assume better fuel economy requires expensive repairs. In reality, it’s often the combination of several small maintenance items that produces the biggest improvement.

Here’s a general idea of how routine maintenance can help:

Maintenance Service	Potential Fuel Economy Benefit	Additional Benefit
Tune-up	Up to 4%	Smoother engine performance
Air filter replacement	Up to 15%	Better acceleration
Correct tire pressure	Up to 3%	Longer tire life
New spark plugs	Significant improvement on older vehicles	Easier starting and smoother operation

Every vehicle is different, but keeping up with scheduled maintenance gives your engine the best chance to operate efficiently. It’s also one of the easiest ways to avoid bigger repairs later.

How Does Driving in West Seattle Affect Your Gas Consumption?

Keeping your vehicle in great shape is only part of the equation. The way you drive every day has a bigger impact on fuel economy than many people realize.

Here in West Seattle, we deal with plenty of stop-and-go traffic, steep hills, and busy intersections. Whether you’re driving along California Avenue, climbing the hills near Admiral, or sitting in traffic waiting to cross the West Seattle Bridge, your driving habits can make a noticeable difference in how often you fill up. According to data compiled by the National Highway Traffic Safety Administration (NHTSA), sensible driving habits can improve fuel economy by up to 40% in heavy traffic conditions.

One of the biggest fuel wasters is aggressive acceleration. Pressing hard on the gas every time the light turns green forces your engine to work much harder than necessary. The same goes for hard braking. Every time you brake suddenly, you’re throwing away the momentum your vehicle already built.

Instead, try accelerating smoothly and leaving enough space between you and the car ahead so you can ease off the accelerator rather than constantly braking. It’s a more relaxed way to drive, it’s easier on your vehicle, and it often saves fuel.

Here are a few simple habits that can help improve your mileage:

• Accelerate gradually instead of flooring the gas pedal.
• Keep a steady speed whenever traffic allows.
• When venturing out of our neighborhood on longer highway drives, use cruise control.
• Avoid carrying unnecessary weight in your vehicle.
• Remove roof racks or cargo carriers when you aren’t using them.
• Combine errands into one trip instead of taking several short drives.
• Turn the engine off if you’ll be sitting for an extended period instead of letting it idle.

Short trips can also affect fuel economy. Your engine is least efficient when it’s cold, so several five-minute trips throughout the day often use more fuel than one longer trip. To minimize idling time, check community-reported traffic conditions on the West Seattle Blog and plan your outings to avoid stop-and-go traffic.

Even the best driving habits can’t overcome neglected maintenance, though. If your tires are low, your engine isn’t running properly, or your alignment is off, you’ll still lose fuel economy no matter how carefully you drive.

The best results come from combining good driving habits with regular maintenance and auto repair.

When Should You Schedule a Professional Fuel Efficiency Check?

If your vehicle has always averaged around 30 miles per gallon but suddenly drops to 24 or 25, it’s worth bringing it in to have us check it. Fuel economy usually doesn’t decline without a reason.

Some warning signs include:

• You’re filling up more often than usual.
• The Check Engine light comes on.
• The engine idles roughly.
• The vehicle feels sluggish when accelerating.
• You notice unusual vibrations or shaking.
• The engine doesn’t seem to have the same power it once did.

Sometimes the cause is as simple as a dirty air filter or worn spark plugs. Other times, the issue could be a faulty sensor that’s causing your engine to burn more fuel than necessary. Either way, catching the problem early is almost always less expensive than waiting for it to become a larger repair.

At Tom’s Automotive Service, we believe in helping customers understand what’s going on with their vehicles. We’ll inspect your vehicle, explain what we find in plain language, and recommend only the repairs and maintenance your vehicle actually needs. No confusing jargon. No pressure. Just honest advice backed by decades of experience.

That’s one reason generations of West Seattle families have trusted us with their vehicles since 1971.

Get More Miles Out of Every Tank

Everyone wants to spend less at the gas pump, and while we can’t control fuel prices, we can help make sure your vehicle is using fuel as efficiently as possible.

Regular maintenance, auto repair, proper tire pressure, timely oil changes, and addressing small problems before they become larger ones all contribute to better fuel economy. Pair those services with smart driving habits, and you may be surprised by how much longer each tank lasts.

Our ASE Certified Technicians use advanced diagnostic equipment to identify problems accurately, and our Service Advisors will take the time to explain your options so you can make informed decisions about your vehicle.

Whether you need a routine oil change, a diagnostic inspection, or more extensive auto repair, our team is here to help keep your vehicle safe, reliable, and running efficiently.

To learn more about our services, visit our Auto Repair Services page. You can also read what your neighbors have to say on our Reviews page, learn more about our history on our About Us page, or schedule an appointment online whenever it’s convenient for you.

We look forward to helping you get the most out of every mile.

Frequently Asked Questions