im in a similar boat with you...
i was thinking all the same things, my 2003 XLS is at 62,???
i wanna get a tune up on mine simply cause ive had for a little bit now and driven it all most 2000 miles since i bought it 2 months ago, and i dont know when the last time she recieved a good tune up...
but im just paranoid about the up keep on any vehicle ive owned, i wanna make sure im getting the full potential out of my ride.
IMO fuel injector cleaner could be added to your list there... when i first bought my XLS, i drove it for a few days to see how she was rolling as is. Then i noticed quite a difference when i put in FUEL INJECTOR CLEANER. the throttle response was alot better after letting her idle for 15 min and let the product run through the engine... again IMO
Danny