Can I switch to a lower grade (octane) gasoline such as regular grade or mid grade when I start using F2020 Fuel Saver?
Most engines that are using premium or mid grade fuel will be able to switch to a lower grade fuel when using F2020 Fuel Saver. This will save you even more on fuel costs. If you happen to notice that your engine knocks with a lower grade of fuel even with F2020 Fuel Saver, switch back to a higher grade fuel.
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