It wont help or hurt you, even if you did tune it. Running cleaner gas and no off brand cheapo **** will help, but running the 89 or 91 really wont help or hurt the life of the engine itself, just take care of it and dont rag on it like I do and it should run forever!
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The octane you run has to do with engine timing and compression. The hemi is capable of adjusting the timing to some degree on its own, which is why you can run 87 or 89 octane. It doesn't hurt the engine. You will not get any benefit running 91 if you don't install a tune, but it won't hurt it.
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87 can be run as long as there's no pinging. Pinging (pre detonation) will damage the engines. Every engine varies, so one person not having pinging issues does not mean you won't have pinging issues. There's also other factors that influence the likelihood of pinging to occur- higher ambient temps, cooling system efficiency, engine load (towing or heavy throttle), etc.
Facts aside here's my opinion:
If your vehicle is running well on 89, and you're not putting a lot if miles on it (ie not much cost savings), stick with 89.
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