See, I used to.
But first up - my averages were going down - saying that I was averaging 14.5km a day when I was entering between 19 - 30km a day - and the average was falling. Then it went into negative - something like my avg distance per day was -204km.
So i emailled the support link. Got no response, and then the emails stopped coming to remind me to fill it out. So I stopped.
Was nice and simple. But I think the back end was a touch flaky.
Buy a bike, park the car, ride your ass off...