This is not an octane booster, rather a 3-in-one fuel cleaning/stabilizing product. I don't believe it has MMT in it, rather PEA:
Section 3: COMPOSITION / INFORMATION ON INGREDIENTS
[Key: Ingredient - CAS # - Wt. %]
Light aromatic solvent naphtha (petroleum) - 64742-95-6 > 60
Polyolefin alkyl phenol alkyl amine -(Proprietary) > 5
Solvent naphtha (petroleum), heavy aromatic - 64742-94-5 > 1
Section 9: PHYSICAL AND CHEMICAL PROPERTIES
Appearance: Clear.
Color: Amber.
Odor: Aromatic hydrocarbon.
Odor Threshold: Not available.
Physical State: Liquid.
pH: Not applicable.
Viscosity: 16 cP @ 40 °C (104 °F)
Freezing Point: Not available.
Boiling Point: Not available.
Flash Point (PMCC): > 62 °C (> 144 °F)
Evaporation Rate: Not available.
Lower Flammability Limit: Not available.
Upper Flammability Limit: Not available.
Vapor Pressure: Not available.
Vapor Density: Not available.
Specific Gravity: 0.85
Solubility in Water: Insoluble.
Coefficient of Water/Oil Distribution: Not available.
Auto-ignition Temperature: Not available.
Percent Volatile, wt. %: Not available.
VOC content, wt. %: Not available