As a leisure and general fitness cyclist I have 543 miles so far in 2017. That does include five imperial centuries, putting me where I hoped to be at this stage.
It may not be the most helpful way of doing things, but I'd like to end the year with number of rides = number of centuries, and I'm still on target for that. I did actually dream last night that I'd failed due to a broken gear cable, and the relief as I slowly realised it hadn't really happened was palpable. I think it's already become an obsession.
But most importantly, I've loved every ride.