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

Product ID: 16201439

⚡Restores lost engine power & acceleration

⛽Boosts octane by up to 10 points

🛠️Cleans fuel system for smoother performance

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¥1634

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

TRUSTED PROVEN - Ranked #3 in Octane Boosters with 4.5-star reviews from over 1,300 satisfied drivers.
POWER UP YOUR RIDE - Elevate engine octane to reduce knocking and pinging for a smoother, more responsive drive.
DUAL ACTION FORMULA - Simultaneously boosts fuel octane and cleans your fuel intake system—two benefits in one bottle.
PERFORMANCE REVIVAL - Restore lost acceleration and engine power, making every drive feel like new again.
COMPACT CONVENIENT - 5.25 oz bottle fits easily in your glove box for on-the-go performance boosts whenever you need.

STP Octane Booster is a premium 5.25 oz fuel additive designed to boost octane levels, reduce engine knocking, and clean the fuel system. Trusted by thousands, it restores lost power and acceleration, ensuring your vehicle performs at its peak with every fill-up.

Specifications

ASIN	B004MBFTYK
Best Sellers Rank	#6,258 in Automotive ( See Top 100 in Automotive ) #3 in Octane Boosters
Brand	STP
Customer Reviews	4.5 4.5 out of 5 stars (1,392)
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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