Tyre pressure on an EV: TPMS, tyre wear and the cost of under-inflation

Where to find the right pressure

Tesla prints the recommended cold pressure on the tyre information label on the driver's side door pillar. It depends on the model, wheel size and version, so a figure from a forum or another car may be wrong for yours. The number on the tyre sidewall is the maximum the tyre can hold, not the pressure to drive on.

Check pressures cold: Tesla's manual says after the car has been parked for more than three hours. Driving warms the tyres and raises the reading, so a warm tyre that reads correct can be under-inflated.

What the TPMS warning really means

Every Tesla has a tyre pressure monitoring system (TPMS) and shows each tyre's pressure on the screen. The warning light is a safety net, not a maintenance tool. The US standard FMVSS 138 requires the warning once a tyre is 25% or more below the placard pressure. For example, a tyre meant to run at 40 psi could drop to 30 psi before the light is required.

So a car can run for weeks noticeably under-inflated without a warning. Glance at the tyre pressures on the screen every week or two, and check with a gauge when a reading looks low.

What under-inflation costs

Energy: a soft tyre has more rolling resistance. The US fuel-economy site run by the Department of Energy and EPA estimates that mileage drops about 0.2% for every 1 psi drop in the average pressure of all tyres, and that correct pressure improves it by 0.6% on average and up to 3%. Those figures come from combustion cars; the physics of rolling resistance is the same on an EV, so treat them as an indication of the direction and size, not an exact EV number.

Wear and safety: an under-inflated tyre flexes more, runs hotter and wears on its outer edges. Steering gets less precise and braking distances can grow. On a heavy EV that shortens tyre life, and tyres are a large part of an EV's running costs.

Why EV tyres wear differently

EVs are heavier than comparable combustion cars and deliver full torque from standstill. Both put more load on the tread, which is why tyre makers sell EV-specific tyres with stiffer structures and harder-wearing compounds. Published estimates of how much faster EV tyres wear vary widely and we could not find a primary study, so we don't quote a number.

What you can control: correct pressure, regular rotation at the interval in your owner's manual, a wheel alignment check if wear is uneven, and a gentle right foot from standstill.

A two-minute routine

Five habits cover almost everything:

• Check the door-pillar label once, and note the pressure for your wheels
• Look at the tyre pressures on the car's screen every week or two
• Measure with a gauge, cold, before long trips and when seasons change
• Rotate tyres at the interval in the owner's manual
• Look for wear on the tyre edges (under-inflation) or one side only (alignment)

Frequently asked questions

What tyre pressure should my Tesla have?

The one on the tyre information label on the driver's door pillar, measured cold. It depends on the model and wheel size, so don't copy a figure from another car.

Why doesn't the TPMS warn me earlier?

The warning is designed for significant under-inflation. The US FMVSS 138 standard requires it at 25% or more below the recommended pressure, so check the pressures on the screen regularly instead of waiting for the light.

How much range do I lose with low tyres?

There is no official EV figure. For combustion cars the US fuel-economy authorities estimate about 0.2% worse mileage per psi of average under-inflation; the effect on an EV is in the same direction.

Do EVs wear tyres faster?

Generally yes, because of higher weight and instant torque, which is why EV-specific tyres exist. Published estimates vary and we found no primary study, so correct pressure and regular rotation are the reliable levers.