If an older car ie 1993 audi says it needs to run on premium, can you put in just plus or regular?

If you're driving around in a 14 year old car that says it needs premium, I'd put in premium.

If an older car ie 1993 audi says it needs to run on premium, can you put in just plus or regular?microsoft works

what is the reccommended octane?

go with that

If an older car ie 1993 audi says it needs to run on premium, can you put in just plus or regular?windows mobile internet explorer

Try going %26amp; asking an owners club - plenty still on Usenet.
I would still put in premium.It probably has a turbocharger which needs higher octane fuel.
You might be able to tune the engine to take a lower octane fuel, but you might not get as good gas mileage, which would cancel out the money saved by buying the cheaper fuel. Don't do anything until you double check - preferably with someone who really knows what they are talking about.
No you can't. If that is what the manufacturer recommends then you need to follow those instructions. I had a car that ran

on premium only. I tried to use regular but it ran horrible. As a matter of fact it would die on me and spit and sputter until I finally found out I was using the wrong gas.
You can put it in but....You will increase engine wear if you use less octane than recommended. In general as cars age the octane requirement can increase. Not a good way to save money. Newer cars can sometimes tolerate lower octane due to their computers making adjustments.