I put by mistake 23 litres e 85 (95 octane) in my car that was almost empty.

I want to avoid paying $500 to flush the fuel if possible.

I have only driven less than 1km after putting the fuel. Can I fill up rest of the tank with 98 octane to prevent any damage to engine.

What options do I have?

I normally just start the car go to work (about 10km) and come back home, no high way driving.

Thanks for replies in advance.