The conservational properties of E10 ethanol fuel for motor vehicles is a myth. If you have a medium sized car, say 2 litres in engine size, driving carefully your car will travel 100 kilometers on 10 liters of regular 91 octane petrol. It is well known that E10 is inefficient in regards to performance and fuel economy. You will not get 100 kilometers out of 10 liters of ethanol-blend. About 90 kilometers would be the distance.
Rounding this up to a whole number we get 10.00 liters.