300+ miles a week here. I lube the chain only after exceptionally wet weather riding. I clean the bike about every other week. I air up the tires when they feel low. That's my "routine" maintenance.

Otherwise it's a chain change @ 3000+ km or when it starts to shift poorly. Tires change every 3000+ km or if I notice any significant cutting in the tire. Look at and if necessary true the wheels about the same time I change tires. Clean/oil derailleurs only if necessary for proper shifting (all that chain grease holds them together and keeps them from squeaking!)