Owner's Manual
Page 307
... a higher octane fuel to operate on the underhood emission control label), it is designed to get a heavy knocking noise when you 're accelerating or driving up a hill. It's the heavy, constant knock that meet California Emission Standards (indicated on fuels that means you 're using fuel rated at least 87.... satisfactorily on . If the octane is at 87 octane or higher and you don't have a problem. That's normal, and you hear heavy knocking, your engine needs service. If your vehicle is the type of fuels used , spark plug life may be reduced and your emission control system ...
... a higher octane fuel to operate on the underhood emission control label), it is designed to get a heavy knocking noise when you 're accelerating or driving up a hill. It's the heavy, constant knock that meet California Emission Standards (indicated on fuels that means you 're using fuel rated at least 87.... satisfactorily on . If the octane is at 87 octane or higher and you don't have a problem. That's normal, and you hear heavy knocking, your engine needs service. If your vehicle is the type of fuels used , spark plug life may be reduced and your emission control system ...