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Gas Is Headed for a Record October. Habits That Actually Save Fuel

Gas averaged $4.27 on Oct. 22, up from about $3.07 a year ago, per AAA. These fuel-saving habits are backed by federal testing, not gas-station myths.

By AutoDex Team, Newsroom · 2026-10-27

Phillips 66 sign posting regular at $4.19 and diesel at $5.19, with a fuel canopy and autumn hillside homes behind it.

Gas prices have eased a little this month, but not enough to change the big picture. The national average for regular was $4.27 a gallon on Oct. 22, down 6 cents from a week earlier but up from about $3.07 a year ago, according to AAA. AAA says October is on track to be the most expensive October on record, after record-setting months in August and September.

You can't control the price on the sign. You can control how much of it you burn. Here's what's driving prices and which fuel-saving habits hold up in testing.

Why prices are still high

The recent dip comes mostly from the seasonal switch to winter-blend gasoline, which is cheaper to make, AAA says. Crude oil is keeping a floor under pump prices. U.S. benchmark crude settled at $97.15 a barrel on Oct. 21, and AAA points to instability in the Strait of Hormuz.

The records are piling up. September averaged $4.33 a gallon, 50 cents above the previous September record set in 2023, according to AAA. And this is the first year the national average has topped $4 in October, AAA reported Oct. 8.

Where you live matters a lot. On Oct. 22, California averaged $6.08 and North Carolina $3.55, per AAA.

Diesel is worse. The national average was $6.31 on Oct. 20, about $2.70 more than a year earlier and down from a record $6.52 on Sept. 22, AL.com reported, citing AAA. For fleets running diesel vans and trucks, that gap adds up fast. Automakers are noticing, too: GM plans to add hybrids across several segments as fuel costs push up demand, CBT News reported.

Gas station price sign showing unleaded at $4.79, mid-grade at $5.19 and premium at $5.59

Posted prices at a gas station on Easter Sunday 2026. Photo: Rick Obst, via Wikimedia Commons (CC BY 4.0).

Drive smoother. It's the biggest lever

Speeding, hard acceleration and hard braking waste gas. Aggressive driving can lower your mileage by roughly 15% to 30% at highway speeds and 10% to 40% in stop-and-go traffic, according to FuelEconomy.gov, the joint Department of Energy and EPA site.

Smoother driving is also safer, which may be the bigger payoff.

Cut the drag and the dead weight

Stop idling, and combine trips

Idling can burn a quarter to a half gallon of fuel an hour, depending on the engine and whether the AC is on. Restarting a warm engine takes only about 10 seconds' worth of fuel, according to FuelEconomy.gov. If you're parked and waiting more than a minute, turning the engine off generally saves money, as long as you aren't starting the car more than about 10 times a day. The site says that start limit doesn't apply to cars with automatic start-stop systems.

Short trips are expensive, too. An engine is least efficient when it's cold, so several short trips from a cold start can use twice as much fuel as one longer trip covering the same distance, the site's trip planning guide says. Run errands in one loop, and share rides when you can.

That matters more as temperatures drop. In city driving, a gasoline car's mileage is roughly 15% lower at 20°F than at 77°F, and up to 24% lower on short trips, according to FuelEconomy.gov. Skip the long warm-up. Most manufacturers recommend driving off gently after about 30 seconds.

Keep the basics in shape

Skip the myths

Premium fuel in a car built for regular. AAA's lab testing found no benefit in horsepower, fuel economy or emissions, and estimated drivers wasted more than $2.1 billion in a year on premium they didn't need, according to AAA. If your car says premium is required, use it. If it only says "recommended," AAA's follow-up research found small mileage gains that didn't make up for the higher price.

A new air filter for better mileage. On modern fuel-injected cars, replacing a clogged air filter can improve acceleration but doesn't improve fuel economy, FuelEconomy.gov says. Replace it on schedule, but don't expect savings at the pump.

Track what you spend

You can't tell whether a habit is working unless you measure it. Write down the odometer reading and gallons each time you fill up. Divide the miles since your last fill-up by the gallons you just bought, and you have your real-world mpg. A sudden drop with no change in how you drive is worth a look by a mechanic.

Feedback helps. Drivers who use feedback devices to save fuel improved mileage by about 10% in one study cited by FuelEconomy.gov. If you use AutoDex, you can log each fill-up in the Logbook, and Insights shows fuel spending next to repairs and maintenance. That makes it easier to see what the car really costs you each month. AutoDex also handles multiple vehicles, so a household or small fleet can keep every vehicle's fuel spending in one place.

The price on the sign will move on its own. These habits pay off either way.

Cover photo: Tony Webster, via Wikimedia Commons (CC BY 2.0).

Sources

Tags: gas prices, fuel economy, ownership costs, tire pressure, car maintenance

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