I agree the terrain and style of riding is going to influence your chains life span. I clean once a week, ride a 50/50 dirt and tar. Spinning on the steep climbs but ride the lower cogs on the flats- 36 ring up front with 11-50 cassette. Have currently ridden x2 chains, now on the 3rd fitted Saturday, GX and KMC 12speed got roughly the same kms on both 2200km Thus is when the gauge dropped through at 0.5. Suppose the test would be to get a XX1 chain and see what it does and not changing my current routine.