I recently noted a "huming" noise when accellerating. Thought it was tires.

4 years on the same tires? How many miles and how often rotated? Noise starting at 10MPH is generally (to me) a little slow for a wheel bearing noise , but besides that and cupped or feathered tires , what else on the vehicle would be consistent with road speed not engine speed or gear? Have the tires checked carefully . Do you have any vibration(s)? Both the tire issue(visually) and the wheel bearing noise (running) can be verified with the vehicle on a lift (best after the tech test drives it with you , to VERIFY the noise you are hearing (not all the others the tech may hear and think is the one you want repaired and then find out his ears heard a different noise). Hope this rant helps......

I wonder if it could be a vacuum hose? Some sort of hose?