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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STP Octane Booster for Gasoline Fuel Additive, Restore Lost Power, 5.25 oz | Fuel cleaner for gasoline engines; 5.25 oz bottle treats up to 15 gallons, compatible with cap-less systems

Product ID: 16201439

⚡Restores lost engine power & acceleration

⛽Boosts octane by up to 5 points

🛡️Cleans & protects fuel system with detergents

S$12

Duties & taxes included

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Description

⛽ Ignite your engine’s potential—don’t let power slip away!

POWER UP YOUR RIDE - Restores engine performance and acceleration for a smoother, more responsive drive.
MAXIMIZE EVERY MILE - Enhances fuel combustion efficiency to improve MPG and reduce engine strain on every trip.
FUEL SYSTEM GUARDIAN - High-performance detergents clean and protect your fuel system from deposits and buildup.
KNOCK OUT ENGINE PING - Boosts octane to reduce knocking and pinging, ensuring quieter, more efficient combustion.
EASY NO MESS APPLICATION - Simply pour into your gas tank—one bottle treats up to 15 gallons, perfect for regular maintenance.

STP Octane Booster is a premium 5.25 oz fuel additive designed for gasoline engines that boosts octane levels, restores lost power, and reduces engine knock. Featuring advanced detergents, it cleans and protects the fuel system while improving fuel combustion efficiency to enhance acceleration and MPG. Easy to use with no mixing required, one bottle treats up to 15 gallons of fuel, making it an essential upgrade for cars, trucks, and SUVs seeking peak performance.

Specifications

ASIN	B004MBFTYK
Best Sellers Rank	#8,367 in Automotive ( See Top 100 in Automotive ) #3 in Octane Boosters
Brand	STP
Customer Reviews	4.5 4.5 out of 5 stars (1,395)
Date First Available	February 4, 2011
Exterior	[[Not Applicable]]
Is Discontinued By Manufacturer	No
Item Weight	5.5 ounces
Item model number	78574
Manufacturer	STP
Manufacturer Part Number	78574
Model	78574
Position	Outside
Product Dimensions	1.5 x 2.3 x 8 inches
Voltage	12 Volts

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TrustScore 4.5 | 7,300+ reviews

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