Are gas-saving myths actually true? We asked an expert


CORPUS CHRISTI, Texas — Whether you are carpooling, using ride-share apps, public transportation, or apps to save money on fuel, drivers are trying to save every bit of gas they can.

People have different ideas about how to save gas, but do any of them work?

Christian Brothers Automotive service manager Reagan Bull said he’s heard of some of the myths.

The first: Driving around town with the windows down and the A/C off.

“You know, it could increase drag having those windows down. And again, it’s how you drive,” Bull said.

Theory No. 2 compares filling up at night versus filling up during the day.

“People said it’s because the tanks are expanded and it’s less air in there,” Bull said. “It’s hard to actually verify. You know, different parts of America (have) different prices, heat, different humidity. Everything is kind of a contributing factor when it comes to gas and filling up.”

And what about having a clean air filter?

“If you can get good fresh air in there without any restrictions, (it) definitely will help with improving your gas mileage,” Bull said. “Simple maintenance items are definitely what can help you.”

One theory may have some solid facts to back it up: using cruise control.

“Keeping your RPMs from fluctuating,” Bull explained. “If you are constantly on the brakes and someone brakes in front of you and you give it gas to get around them — every time you give it gas, you are using more and more fuel.”

Sabrina Tellez said she uses her car’s cruise control as much as it makes sense to.

“I’ve done it on the highways, I’ve done it down the street and, honestly, I feel like it actually works,” she said.

One theory, Bull said, is absolutely true, though.

“So I fill up half a tank or so,” he said. “They say the air in the tank will cause more of the fumes to blow back because there is a higher pressure in the tank, so you are actually asking for more gas when you are filling up with a lower amount in the tank.”

This story was first reported by Corderro McMurry at KRIS in Corpus Christi, Texas.


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