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Forget the higher octane unless you are going down to sea level altitude.
I would only replace the charcoal filter if you can confirm it is bad. The charcoal holds fuel vapors in suspension. Those vapors are released into the intake manifold the next time you start the car.
Symptoms of a failed charcoal canister would be a fairly strong fuel smell after shutting the engine down or after refilling the tank. To prevent the normal fumes from a refill being incorrectly diagnosed wait at least ten minutes after a refill.
Charcoal canister replacements are so rare, the only ones I replaced in 30 years were due to collision damage.
regards
mech
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