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

⛽Boosts octane by up to 10 points

🚗Restores engine power & smoothness

⚙️Cleans fuel intake system effectively

$11.20

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Description

⛽ Ignite your ride’s true potential—don’t settle for less!

KNOCK FREE DRIVE - Eliminate annoying knocking and pinging instantly
PERFORMANCE REVIVAL - Bring back lost horsepower and acceleration
POWER SURGE FORMULA - Elevate your engine’s octane for peak performance
DUAL ACTION CLEANSER - Cleans fuel system while boosting octane—two benefits in one
TRUSTED TOP RANKED - Join thousands who rate it 4.5 stars and counting

STP Octane Booster is a premium 5.25 oz fuel additive designed to boost octane levels, reduce engine knocking, and clean the fuel intake system, effectively restoring lost engine power and performance. Highly rated and a top choice among automotive enthusiasts, it’s your go-to for a smoother, more powerful drive.

Specifications

ASIN	B004MBFTYK
Best Sellers Rank	#7,736 in Automotive ( See Top 100 in Automotive ) #3 in Octane Boosters
Brand	STP
Customer Reviews	4.5 4.5 out of 5 stars (1,410)
Date First Available	February 4, 2011
Exterior	[[Not Applicable]]
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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$11.20

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Fantastic experience overall. Will recommend to friends and family.

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