99 > 95 Octane

Hi, I had to drop in some 95 Morrisons fuel in to the car (£5 worth) because I was literally about to run out and was in a rush to get to University. The tank was nearly empty and it's taken three days for me to get through the £5 driving extremely economically, I've not gone over 4kRPM.

Do you think that the car has readjusted itself to 95 octane, as I know it takes a few tanks of 99 to get it to readjust again? Do you think it's worth just disconnecting the battery for 15 mins to get it to relearn?
 

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