Hi Ana. For my specific case...
1) How do you keep your commuting bike in good shape? I might be able to keep my bike inside while I work, but what about commuting to other places?
I park in a busy outdoor/uncovered bike parking area, at the store it gets chained to an exposed bike rack.
2) Did you replace the stock saddle on your commuter bike?
I have a Trek 7.5FX in the guys model so I swapped the seat for a Terry Liberator. The guy seat was a torture device.
3) Do you use clipless pedals on your commuter? I'm considering an spd/platform pedal (spd on one side, platform on the other).
I use plain old platform pedals, I can't do clipless on any bike (bad knee problem), and they seem to work just fine.
4) Is the maintenance cost for a commuter bike comparable to that of a road bike?
I find my maintenance cost are a little higher than my road bike due to the exposure to weather and the road debris that likes to eat my tires on my commute route. Keeping the bike waxed and well lubed seems to help quite a bit. And just an FYI, maintenance costs could be lower if I would learn how to do some stuff myself.



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You currently live in and will move to a place where you can have the bike inside when at home. 
Also regular routine maintenance, cleaning & lube, lube and clean. A tune up about once a year.
10 years. Finally began wearing out so I replaced the seat and seatpost.
). However, it's doable. So when I go home tonight I am going to bring the silly thing *under* the carport instead of sticking out (I have four bikes so I didn't ride it today, but I didn't think ahead and parked it badly), *and* take a rag and tri-lube to the chain. I am going to try to get into the maintenance habit.
I have a 7500 FX (older version of 7.5) that I basically don't take out into the rain; it's my fast bike (skinny tires). Get a saddle that works 