[davepl]

I almost jumped into the "Where to find ethanol-free gas" thread because in there someone said buy 89, add some booster, and you're right back to 94.

Not so.

Read the label of ANY so-called 'octane booster', and all they do is remove deposits in the combustion chamber that would otherwise cause an increase in compression ratio and possible detonation.

Even worse, when it says "Raises octane 4 points", that means RIGHT of the decimal. From 89.0 to 89.4. Not 93.

I can't believe the FTC hasn't punted these things from the market twenty years ago.