@ Cocylist!
Thanks! Love the way a TDI sounds and drives, especially the ones with uneven amount of cilinders. Raw when idling but smooth when driving.
My tire pressure is already quite high: 2,8 bar. But the stock tires are too wide and will be replaced next year with narrower ones to reduce rolling resistance. A lightweight rim could help you more than closed hubcaps, perhaps. But they are very expensive. I'm looking for some forged Audi rims,
https://www.original-felgen.com/8l0601025ez17.html
The gearbox is the well known 5 speed manual - MQ250 - also used in the Golf. But mine has probably a wider ratio, so a longer 4th and 5th gear.