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user16171
How old are you? How fit are you? Do you suffer from any physical impairments?
Any reasonably fit person under the age of 80 is capable of riding 100 miles or more.
The one thing that might stop you is your statement "if I can avg a decent enough speed that I don't slow down the guy im riding with" [from that statement I would guess you are not over 80 and probably not over 30]
You need to pace yourself and not take someone else's pace. You should end the ride at the same pace that you start it at, or rather start at the pace you intend to finish. Keep your heart rate low. Gauge this by speaking. If you can hold a conversation: good. If not, slow down. If you have no one to speak to, sing. A pace with a low enough heart rate can be maintained for a long time.
Take plenty of water, refill when necessary. You should get through around 6 750ml bidons on a 100 mile ride depending on the weather. Eat and drink before you leave. Take food.
If a fat old man like me can ride 100 or more miles with ease, you should have no trouble.