Looks like Bellingham is only 100+/- feet msl so you should be fine running higher octane gas. You might try some premium with an octane booster if you are really concerned about it. I live on a very dusty road & am not that worried about it. I put over 115K on my old 3.7 & never had a problem with the engine. Drivetrain on the Liberty was a different story but the motor was fine.
Change your air filter regularly & you should not have a problem
There is always the injector cleaner gas additive if you put much faith in that.
I used the carb & choke cleaner regularly on the 400's 289's 350's but those had an open filter element & older gas tanks so dirt was a concern.
& DAMMIT I WANT A FUEL FILTER THAT CAN BE CHANGED!!!!!!!!!
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