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I have a Toyota Blade 2008. I used premium fuel in my car a couple of weeks ago. The fuel lasted a lot longer than 91 and the car ran well.

Can you tell me if it will damage the car in the long run, if I keep using it?

Hi there,
Increasing the octane rating used won't normally create any problems and sometimes makes a difference and sometimes not so noticeable (apart from spending more on the cost of fuel). Modern vehicles have sensors which allow the engine operation to adjust accordingly.
It could be a problem if it was the other way, lowering the octane on a vehicle designed for a higher one, can cause catastrophic failure.