Audi 80 B4 Purchase decision

Since I will soon be 18, I wanted to get some information about the Audi 80 B4. Therefore a few questions: 1. I tend to nem B4 TDI 90ps only, I find on the Internet only which with a mileage over 200000, and if you have less KM so around 150000, then the cars are overpriced again. Therefore I want to ask with how much KM you can buy a B4 TDI 90 Ps still. 2. How much gasoline does a B4 TDI 90 PS, B4 90 PS, B4 116 PS ? 3. I have heard that the 90 PS b4 more Spri t consumes like the 116ps B4? Is this allegation correct? 4. What are the most flaws in an Audi B4? Thank you for the answers. MFG