i use nulon octane boost every 3rd fill. Its pretty expensive $11. but it seems that i get better fuel economy, smother feel from the engine (dont know if its just all in my head tho) but it seems to do it job well.
its works exceptionally well if you have an older car, however if you have a newer car you wont feel the differences.
It is also used when people get water in their tanks, from dirty fuel...
smells really weird tho, dont get it on ur fingers lol
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