Bill Hogarty wrote:

All 3 of my tires lose about 5 lbs of air per week.  This has been happening
since day one.  At 150 hours, its time to replace the original tires.
Should I replace the tubes as well??

...only if you want them to keep the air you put in them... :-) I added air to my tires at 6 months, and will probably do so again next
month at the Condition Inspection time. Needing air once a week sounds like
a slow leak. Easiest to check is the valve stem, but in any case, the tubes
should hold much better than a week...

Bob P