Yamaha Majesty 125cc drinks petrol why is this?

Hi I have a Yamaha Majesty 125cc It is a very nice scooter etc but one downside is that it is very heavy on petrol where I live 10 euro will fill the scooter full. I filled it up today and I went for a drive on it down on the dual carriage way at 100kmh than on some country roads at 80kmh is the reason it is drinking the petrol because its a very small engine and single cyclinder and it is working very hard as the top speed is 140kmh and it is going 100kmh I thought that is the reason thanks for answering. I will have to fill it up again tommrow can you tell me how many miles I should get out of a full tank.

Thanks for answering
 
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