LonePalm,
I would, in my opinion, not drive around with the MIL illuminated as it would possibly mask any future issues that really are issues. I have the same problem with my Subaru WRX Wagon often throwing a P0420 at me because I put on an aftermarket hi-flow cat exhaust and never had it tuned for that, but everytime the MIL comes on I use my installed ECUtek monitor to read the code immediately and reset the ECU at the next stop to clear the light, so that I may see when something else goes wrong.
I would, in my opinion, not drive around with the MIL illuminated as it would possibly mask any future issues that really are issues. I have the same problem with my Subaru WRX Wagon often throwing a P0420 at me because I put on an aftermarket hi-flow cat exhaust and never had it tuned for that, but everytime the MIL comes on I use my installed ECUtek monitor to read the code immediately and reset the ECU at the next stop to clear the light, so that I may see when something else goes wrong.