Sorry about the terrible posters on this forum. You can tag your notes or fill ups in order to sort between winter and summer tires. Then you can search for fuel-ups and notes with a certain tag on them. The tagging is just a multipurpose feature that you can use for any condition you want to apply to fuel-ups.
The reason for a paper log is that seasonal tire changes are infrequent, happening as they do about every six months. The paper notebook is immune from changes in operating systems, and even from the chance of a site going dark. If you truly value your information you need a copy of it, properly updated, independent from the "cloud."