The short answer
Check monthly when tyres are cold, using the pressure on the driver’s door jamb sticker — never the number on the tyre sidewall, which is a maximum. Correct pressure improves fuel economy by up to 3% and stops uneven wear.
Tyres lose about 1 psi a month and more in cold weather. A $10 gauge outlasts several sets of tyres.
Step by step
- Find the recommended pressure on the driver’s door jamb sticker or in the manual.
- Check when cold — parked three hours, or driven under 2 km.
- Unscrew the valve cap and press the gauge on squarely until the hiss stops.
- Read the value and compare with the sticker (front and rear can differ).
- Add air in short bursts, rechecking each time; release with the gauge pin if over.
- Refit the caps and check the spare twice a year.
What you need
- Tyre pressure gauge
- Air compressor or station air
- Gloves
What it costs
| Item | Typical cost |
|---|---|
| Digital tyre gauge | $8–$20 |
| 12 V compressor | $25–$60 |
| Petrol station air | $0–$2 |
| New tyre from uneven wear (What you are avoiding) | $90–$250 |
Common questions
Does the TPMS light mean it is fine until it comes on?
No — it typically triggers at 25% under, well past the point where handling and wear suffer.
Do I add pressure in winter?
Pressure drops about 1 psi per 5.5°C. Top up to the same sticker value when cold.
Nitrogen fill?
Marginal benefit for road cars. Regular checks matter far more.