How close does one need to be in order to be considered drafting? I ride as fast as I can on my commute (mostly Rail Trail) which is pretty slow. Occasionally, I will get passed by someone [on the trail] going a little faster than I and I will come up to about a bike lengths gap, and over about half a me and try to keep up for a couple miles. It makes me feel good to ride at the faster pace, which feels like reduced effort, but it may be adrenaline. I'm not fast enough to have ever had anyone ride behind me who wasn't just blocked. I'm new to commuting this year, and nobody has ever been mean to me when they see me doing this, to announce my intention, what should I say?