How much PSI to put in your car tires for daily driving, heavy loads, winter, and the spare, plus how to work out how much air to add.

What counts as normal tire pressure for different vehicles, which pressure changes are expected, and which readings mean something is wrong.

How to read a tire pressure reading on any gauge or dashboard display, what the units mean, and how to compare it with your recommended pressure.

What recommended tire pressure actually means, why vehicle makers set it, how it differs from the tire’s maximum, and how your TPMS uses it.

Where to find your car’s correct tire pressure, why the number on the tire is the wrong one, and when front, rear, and spare pressures differ.

How to inflate your car tires at home with a 12V, cordless, or garage compressor, from finding the right PSI to checking the result.

What each tool in a tire plug kit does, how to use them in the right order, and the mistakes that cause plugs to leak.

How a tire is properly patched from the inside, which punctures qualify, how it differs from a plug, and whether you can do it yourself.

A step-by-step guide to adding air to your tires at a gas station air machine, including how to find the right PSI and avoid common mistakes.