This is not so much a technical question as much as it is an interesting story, today I went to the dealer because there was a strange noise that sounded like a cross between a bad bearing and a flag waving in the wind, also it only appeared over 90 km/h and was quite noticeable. Anyone that does not care about the full story please skip to the last paragraph.

So I went to a normal Toyota dealer at about 10 AM this morning and they went for a test drive and at around 11:30 AM, after 1 and a half hours they sent me to the main dealer since they had replaced the back bumper earlier this year and they thought it was the bumper.

Got there at about 12:15, and went on a test run after we got back and they did a lot of careful inspection they finally figured out it was the fuel lines touching the car body. It was not obvious, the lines were on their original plastic fixing supports, all it took was pulling on them by hand (away from the car body) and going for another test run and the sound was no more. I did not pay anything since the car was under warranty, and am only writing this story in case it may help someone with a similar problem not waste a lot of time (especially if the car is not under warranty and the mechanic is charging by the hour). I only left the dealer at 14:00, so as you can imagine it took a lot of time.

In conclusion, if your car is making strange noises only above a certain speed check the fuel lines don't touch the car body.