Gas-Saving Tips That Actually Work

When fuel prices soar, all kinds of gas-saving schemes get floated. We separate the serious from the silly for you.

With gas prices reaching all-time highs and forecast to stay high, plenty of people are feeling pain at the pump.

Driving less, riding a bike, taking public transportation – sure sure sure. Plenty of us HAVE to drive. So other than swearing a lot when filling up, what action can you take? When fuel prices spike, lots of tips and tricks to save on gas get trotted out. They’re not all worthy.

We’ve narrowed them down to seven that don’t violate the laws of physics, compromise safety or insult your intelligence.

1) Get the Junk Out of the Trunk

Car engineers spend a lot of time and engineering pounds, ounces and grams out of today’s cars. Don’t undo their efforts (and the gas savings they represent) by leaving unnecessary items in the luggage compartment, on the back seat or in the bed. Golf clubs are a common violator, but so is random dead weight like those boxes of books you keep meaning to donate. Or, dear lord, a case of individual water bottles for after-workout hydration.

Every time you accelerate, you’re using gas to get that stuff up to speed with you. And frankly, every time you brake you're turning that energy into heat. How much gas are you wasting? This depends on your car, but the EPA estimates a 1% in fuel mileage reduction per 100 pounds. On a per-gallon cost basis, that’s about $0.04, using the EPA baseline figures. Get your stuff in order and you’ll save money, too.

2) Get the Rack Off the Roof

When they’re not worrying about the weight of their designs, auto engineers worry about aerodynamics.

Improvements to how your car slips through the air matter most at high speeds — highway miles. The most common way drivers hurt their aerodynamics, and thus mileage is by putting items on the roof.

Do you have activities (cycling, skiing, going down to the beach house) that mandate a lot of equipment? Consider whether you could use a hitch-mounted rack or box instead. Tucked in the slipstream of your car, these will save fuel.

If you must put items on the rooftop (perhaps you kayak), remove the rack when you can.

And, finally, if your vehicle came with a factory roof rack that you never use, see if you can remove the crossbars. You’ll save a few pounds this way, too.

3) Combine Your Trips

Okay, this sounds like a nag, like being told not to use the trunk for storage. “If life weren’t so crazy, I’d be doing that already!”

We know. Still, we will repeat the reasons why planning ahead can save gas:

If grouping trips means fewer miles driven, well, that’s obvious.
But even if you have to go in multiple directions, all non-electric cars use more fuel when the engine is cold. So the fewer times you bring the engine up to temperature, the better. Cold starts aren’t good for your car (or the environment, for that matter).

4) Don’t Let Your Car Idle

Americans continue to wildly overestimate how much fuel it takes to start an engine versus to keep it running. The reality is, once you’re stopped, your car is wasting fuel after about 7-10 seconds of idling. That’s why newer gas cars (and virtually all hybrids) have a feature that shuts the internal combustion engine off during stops when the brake is applied. The car’s still on, but the engine isn’t. Push the pedal and the engine snaps back on and off you go.

The feature annoys some people (and in truth the smoothness of the systems varies among vehicles), but the gas savings is real. Watch this video from Engineering Explained to see the science behind these claims.

If you want to maximize mileage, don’t disable the auto on-off feature. And everyone can stop leaving their car on while running back into the house, or whatever short errand you’re doing. You're not an Ice Road Trucker. And it’s a prime way to get carjacked.

5) Drive Slowly. Errr, Wisely!

No list of gas-saving tips would be complete without the admonition to slow down. There’s no getting around the fact that lower speeds require less fuel, most because aerodynamic resistance increases with the square of speed.

So, that’s the lecture. But driving to save fuel doesn’t have to be a dull crawl in the slow lane. Try thinking of it this way: brakes turn your money into heat, so can you avoid using them?

This isn’t meant to encourage dangerous behavior like not stopping for stop signs or the like. Rather, tune your anticipation skills. Look down the road farther, and coast down when you know that traffic signal’s going to change to red. You might actually find it rewarding. Bonus: You’ll be a safer driver, too.

While hybrid and electric vehicles are best equipped to take advantage of this style (through regenerative braking), many conventional gas cars now engage power-sapping accessories like the alternator during coast-down to maximize fuel efficiency.

As for accelerating, if you know you’re going to be holding a higher speed for a while like when you’re merging onto a highway, go ahead and push the gas as hard as you need. Not only is slow acceleration in this situation potentially dangerous, but it doesn’t actually save fuel.

6) Don’t Rely on the Tire Light

All cars built since 2007 have what’s called Tire Pressure Monitoring Systems (TPMS). These do what the name says: monitor that your tires have air pressure.

The hitch is this: That light may not come on until a tire is more than 25% lower than the recommended pressure. And if you wait for that, you’re potentially endangering yourself (an underinflated tire can compromise your car’s handling or even lead to a tire blowout) and wasting money (underinflated tires reduce your gas mileage by roughly 0.2% per pound that they’re low). Doesn’t sound like much, but try this math: If your recommended inflation pressure is 40 psi, and you’re 25% low on air, that’s a 2% hit to your gas mileage. Plus, underinflated tires wear more quickly and unevenly, reducing your tire life.

There’s just no substitute for buying a decent-quality tire gauge (between $5 and $15) and using it at least once a month. Even if you can figure out how to get your vehicle’s TPMS to show each tire’s individual pressure on your information screen, we’d still backstop this with a handheld gauge.

7) Embrace Fuel-Saving Apps (And Join the Club)

Finding the cheapest fuel can be a 'sport' for some. But phone apps like Gas Buddy and Gas Guru make it almost too easy to find the best gas deals. Since you can use them to screen for brands, you can also make sure you’re getting good quality fuel, which, in the long run, matters to the health of your car.

Joining a membership club like Costco or Sam’s Club could also pay off. Figuring how quickly you’ll recoup your membership cost with the per-gallon savings on their discounted fuel is pretty easy math.

Source: Kiplinger, David Muhlbaum, March 2022

Have questions about saving more money beyond the gas pump? Let's chat, give me a call at 480-513-1830, or schedule a time to chat via my calendar, Chat With Charles.