In many people with tinnitus, the cause is not known. The ear is otherwise fine. What seems to happen is that signals are sent from the ear down the ear nerve to the hearing part of the brain. The brain interprets these signals as noise. It is not clear why these signals are sent from the ear.
Octane booster is  a product which is designed to rise the octane rating of the fuel. The main idea behind using boosters is to increase power and also vehicleâs efficiency in certain engines. These have anti knock additives which when added to fuel prevent the onset of knock (detonation or pre ignition).
A recent question about octane and a visit to a paint store made me wonder: Can I add Xylene to my gas tank to boost octane? My car calls for 89 or better octane, but I can usually get away with using 89 every second or third fill-up without getting noticeable spark knock. On the rare occasions I've filled with Sunoco 93 octane fuel, I can smell xylol as I'm filling my car.