I cant find anything to back them up either.

My RAV4 was $30k, took a loan on it for about 25k, no interest, it's paid off. In terms of maintenance I've put ~$10k on it over time.

It gets 22mpg, and I drive <10k miles a year. Currently at 53k miles, that gives us ~2410 gallons of gas. I'll be generous to account for the spikes in gas prices and say it was $4/gallon -> $9640. At 6 ish years, that's now ~$60k It's a Toyota so I expect it will last a while. Taxes started at $400/year and are now $150/year. That's about a cost of $10k/year. In the unlikely scenario I keep it for 20 years, I might hit $200k over its lifetime.

If people are spending €1.5m over the lifetime of their cars, they are getting scammed