Errrrr .......... you kept up with and drafted a chav on a MTB wearing a tracksuit, bum hanging out and kackered trainers for half a mile? Wow ......... you are awesome. Team GB material

. Anyway you were dropped.
I draft fellow commuting club roadies all the time, except they are on plastic road bikes and I am on my Brompton. As I slow and they come by I stick to their rear wheels. I get a free ride for a few miles sometimes all the way 12-13 miles. Works every time. If there are a few out then bonus as extra wind protection.