That said, in a relatively clean fuel system, one that is routinely maintained by B-12 Chemtool, for instance, your observation can actually be explained by the presence of the solvents themselves. It turns out that the oxygenated solvents in the cleaner are great at removing gum and varnish do not offer as much power as the hydrocarbons in gasoline. That’s why E85 fuel burns cleaner but gets lower fuel economy than E10 gasoline. The difference in the fuel economy of a clean system should be minimal, but that difference (along with cleaning efficacy) will increase as the concentration of B-12 Chemtool is increased.
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