Dave2013M3
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Also keep in mind that when a bottle of octane booster says it raises octane by a "point", that actually means it will raise octane by ~.1-.2. So 91 octane becomes roughly 91.1 or 92.2 maybe. You spent a lot of money to go up a tenth of an octane.
The link posted by mdnt has good info. Cheapest boost is bulk purchasing toluene and following the guides people have put together for ratios per gallon of fuel.
Not the Torco, see my chart..
Dave
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