Yes
93
BMW only takes gas rated at octane 91 or higher, and that is Premium at the gas station.
BMW always recommends using 98 RON petrol (gas). Which is premium unleaded.
Super or 93 Octane
Yes, a person can use regular gasoline in a 2001 Audi A$ Quattro 2.8L. However, regular gas is known to diminish the performance of this car.
" regular " unleaded , 87 octane
As you failed to list which model 2000 BMW, I cannot provide an answer. BMW makes many vehicles including diesels. All I can tell you is to use exactly what the owner's manual states. if it states Premium, then use Premium. Using Regular can cause engine damage over time. If it says use Regular, then use Regular. The use of Premium is a waste of money and provides no benefit whatsoever. Of course it it is a Diesel, then use the correct Diesel.
The 2001 BMW M3 runs on premium unleaded (required).
The 2001 BMW M5 runs on premium unleaded (required).
The 2001 BMW X5 runs on premium unleaded (required).
Yes. You may not get the same performance (horsepower) as you would with premium gas, but modern cars can run fine on any grade of unleaded gas.