Of all the ways to cut your fuel bill, checking your tire pressure is the cheapest and quickest. It costs nothing, takes five minutes, and most drivers don't do it often enough.
Why it matters
When tires are under-inflated, more of the tire touches the road and flexes as it rolls. That's called rolling resistance, and your engine burns fuel to overcome it.
The numbers are real. A 2026 study by tire maker Continental found that keeping tires within the recommended pressure range improved fuel economy by 4.5% on their test vehicles. Research on passenger cars estimates that every 1 PSI (about 0.07 bar) below the recommended pressure costs around 0.2% in fuel economy, and it adds up quickly when tires are several PSI low.
Winter makes it worse
Air contracts in the cold, so tire pressure drops as temperatures fall. Tires that were fine in September can be noticeably low by December, without any puncture.
How to do it right
- Find the right pressure. It's on a sticker inside the driver's door, inside the fuel filler flap, or in your owner's manual. Don't use the number on the tire wall: that's the maximum, not the recommended pressure.
- Check when tires are cold, before driving or after the car has been parked for a few hours.
- Check once a month, and before long trips.
- Load matters. Many cars list a higher pressure for a full load. Use it for holiday trips.
Bonus: safety and tire life
Correct pressure also improves braking and handling and makes tires last longer, so you save twice.
Photo: Crystal Kwok on Unsplash