octane boosters follow along the lines of snake oil.
I dunno what MMT really, truly is, but I don't think it's that potent to handle 20gallons of gas.
a lot of octane boosters are misleading, a lot boost say 3 points, the fine print is. .3 (tenths). so you'd allegedly have 87.3 octane.
Like Lucas's octane booster, says 30 points, so that's allegedly 87 octane to 90 octane, PLUS the Lucas formulation is supposed to have their fuel treatment added in as well, so for $10, it's a good bang for your buck.
When I go for my smog check, I put in the 91 octane, PLUS a bottle of Lucas octane boost or a can of Seafoam. It's just a superstition, and I can't break the habit, but I've passed super clean since 1991!