I love tyres. Obviously. Who doesn't? Here's what you need to know when you need to replace them.
Read MoreThere are several good reasons to keep your tyres fully pumped. Unfortunately, saving massively on fuel isn't one of them
Potential Fuel Saving: up to five per cent
Essential for safety, moderately useful for consumption
A modern radial tyre with 25 per cent of the air let out of it looks like