Premium fuel?
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Premium fuel?
Do you guys think premium fuel is required or has to be used if the manual recommends it? My vehicle (its not a Ford truck) doesn't have a knock sensor and the manual recommends 91 octane gas. Currently I'm using 89 octane (its a gasahol) and I worrying about knocking and pinging. I know knocking and pinging is more likely if you run the vehicle hard, and I do so I don't know if I should be using the 89. When I accelerate hard it makes an unusuall noise but it's not a knocking sound. I don't know how to explain it maybe its the bearings I don't know. I guess I could run this tank of gas until its almost empty and then put 91 octane in and see if the mysterous noise goes away? Any thoughts?
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