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You can always dose your gas with 4 oz/10 gallons of TC-W3 2-cycle oil or Marvel Mystery Oil. Some people have shown gains in FE with those additives. They are supposed to restore lubricity to the fuel. And they're pretty cheap per tank.
I do know MMO works quite well at quieting down your fuel system, running it in my car right now. No data on increased FE yet.
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2012 Chevrolet Cruze Eco 6MT
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