How many gallons does it treat?

The front of the container states "Treats up to 21 gallons" -- my husband uses this product in our 1965 Mustang, which has a tank size of 16 gallons. Depending on how often he drives the car and fills the gas tank, he uses 1 bottle with each fill up. I hope this answers some of your question.

does this work on a 2 stroke?

Does your 2 stroke recommend a higher octane - 89+ and you can't get the fuel? if so, use it

Is this safe for use with catalytic converters?

I am using it in a 66 Mustang and a 73 Z28 neither have converters, so not sure

Will this stuff boost 93 octane to 95?

Yes, I think it is a gain of just under 2.5 octane numbers when added to 12 or 14 gallons.

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⛽ Ignite your engine’s potential—because every drop counts!

ENGINE DETOX - Synthetic formula cleans fuel intake, enhancing combustion and horsepower.
JET FUEL INSPIRED - Formulated with high-quality jet fuel carrier for superior active ingredient delivery.
POWER UP YOUR RIDE - Boosts octane to reduce knocking and unlock smoother acceleration.
EASY ROUTINE UPGRADE - Just one 5.25 oz bottle treats up to 15 gallons—use with every fill-up for consistent performance.
FUEL SMART EFFICIENCY - Optimizes fuel use to improve miles per gallon and reduce engine strain.

STP Octane Booster is a 5.25 oz fuel additive designed to boost octane levels, clean the fuel intake system, and restore lost engine power and acceleration. Its synthetic technology improves fuel flow and combustion efficiency, helping to increase horsepower and improve miles per gallon. Ideal for use with every fill-up, one bottle treats up to 15 gallons of gasoline, making it a simple yet powerful upgrade for maintaining peak vehicle performance.

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Manufacturer	STP
Brand	STP
Model	78574
Item Weight	5.5 ounces
Product Dimensions	1.5 x 2.3 x 8 inches
Item model number	78574
Is Discontinued By Manufacturer	No
Exterior	[[Not Applicable]]
Manufacturer Part Number	78574
Position	Outside
Voltage	12 Volts

STP Octane Booster, Bottled Fuel System Cleaner Restores Lost Power and Acceleration, 5.25 Oz, STP

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