When I bought that mint Mark 4 19kmiles two years ago the previous owner had not used it in the previous three years eg 250 miles between mot's.I did a couple of 1200 mile trips in short order and started to suffer extreme outer edge tyre wear on the front nearside.
Broaching the subject on here I received lots of advice and having owned a Mark 1 for sixteen years knew that the Ls400 does suffer from reasonable outer edge tyre wear mainly because of heavy cornering.I took the Mark 4 to Lexus who said the teletrimy was spot on but the tyre continued to wear excessivly .I then went to Devon to see family and had the teletrimy checked at the Mitsubishi dealership in Barnstaple,they found everything fine.
I was advised to check how old the front tyres were (Dunlop sport )they were the original tyres supplied with the car ,over ten years old ,quick visit to my tyre supplier two new Falkens and no more uneven tyre wear.
Age from all accounts weakens the tyre wall and causes outward sag so the outer edge of the wearing surface makes heavier contact with the road.There are set time limits on the use of tyres and just because they look ok they could in fact be dangerous.