taking another 300 million euros just to cover extra fuel costs is important. That needs about 7-8 million extra pax or a significant 4-5 euro extra revenue per pax. Ryanair is not going to have it easy and in the winter months the higher fares will make filling the planes harder.
Also get the maths correct 1% of 737-800 is 1.8 people. If repeated monthly am average 1% drop takes about 28 million euros off the income. Pax pay very different prices and the effect will be a lot more if its the late bookers who are flying less.