My main commuter & a few others that get a few miles on them are running tube sealant. I started using about 18 months ago I really don't want to be delayed fixing a puncture especially in winter. I have 2 running slime tubes I got reduced but not done a lot of miles on them. My main one is running Muc Offs tube sealant & unlike their regular tyre sealant doesn't go off. I got it discounted when I worked in a bike shop & even cheaper online from Aldi (not currently available). Done over 2000 miles before my only puncture so far. It was a slow one & would hold for a couple of days. On investigation it was a cut about 3mm that kept opening. Patched & so far so good. I didn't top up as little evidence of much leakage. Most of my ride is off road then urban cycle-lanes & city streets so a mix of puncture opportunities.