Toyota Aurion Problems

No, I doubt very much that you would be able to see any marked effect of running 2 psi lower.

The Aurion is rated to tow up to 1600 kg (with trailer brakes), which should be enough to handle a small caravan safely. Toyota has a factory-approved tow bar for the Aurion, so that’s probably your best bet.

I can’t answer your question directly because I don’t know what protection product you are being offered, but you need to understand that it is the dealer who is offering it you, not Toyota. I would ask the dealer why he thinks Toyota’s paint and trim isn’t up to scratch, such that it needs extra protection. Ask also how it works and what it will do for you, and how you would know if it wasn’t doing the job. In my view these products are not worth spending your hard-earned on.

I would swap tyres from side to side, as tyres can often be a contributor to this sort of problem.

I don’t believe there is any such standard applying to build quality. What you would need to do is to bring in someone experienced in the industry and present their opinion to the tribunal. You could try Graeme Cuthbert (0422 444 335).

You don't have any comeback on Toyota to provide with a fifth alloy wheel, the Aurion is supplied with a steel wheel as a spare, as many cars are. It's a full-sized spare wheel with a full-sized tyre so there's no problem running it for as long as you need.

It is a problem that most carmakers seem to be suffering from, one they need to address. I would think that, instead of letting cars go with out-dated maps they should check them during pre-delivery and update the maps to the latest available. Seems simple.

Both have timing chains so there's no requirement to service them.

Describe it to the dealer in your own words, and if it’s possible demonstrate it to them on the test drive. That way you can be confident they understand what it is you’re complaining about.

The fuel consumption does appear to vary a lot, too much I would suggest, so I would definitely have the dealer check it. The knocking noise could indicate a faulty knock sensor.