I have not yet checked the full kms on this ride, but 100 kms is not very far, But I am sure it is a small tank and you should be able to fill and catch up very quickly. Due to the large number of riders going, possibly 2-300 or more, stopping will not be an option. The best would be to be at the front and you could probably stop and fill before the rest even got passed by. See me when you arrive and I will make sure you can be near the front. Thanks, JOHN