Keeping records

[Moodyman]

I log my commutes on a spreadsheet along with purchases and any replacement of parts.

That way, I can work out the cost of my commuting, longevity of parts and when to budget for replacements.

I also do the same for my car (driven by the wife) so that I can compare the yearly cost of running one vs bicycle.

I don't log my leisure rides

 

[jugglingphil]

I usually log rides of around 3 miles and over, by each bike, and find this information interesting (doubt anyone else would).
But I do many journeys of less the 3 miles, so I never know total annual mileage, but can jump on bike and ride to shops/work/friends without any form filling.