I had already bought a replacement chain & a gauge tool.
I check it every 100k when I lube it, but the 0.75 still won't drop in.
My local shop recons by the time it need replacing, the gears will need replacing as well.
I always use my gears instead of cranking up the power.
I never stand up on the pedals.
I don't ride in wet conditions.
I only use dry lube.