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.

Stp Octane Booster Restore Horsepower Boosts 155 Ml

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Description

⛽⚡ Unleash hidden horsepower and drive like you own the road!

EASY REGULAR USE - Simply add at every fill-up to maintain consistent performance gains.
POWER UP YOUR RIDE - Boost octane levels for peak engine performance and smoother acceleration.
KNOCK OUT ENGINE PING - Reduces knocking and pinging to protect your engine and enhance driving comfort.
CLEAN FUEL CLEAN DRIVE - Removes harmful deposits from the fuel intake system to restore lost horsepower.
CAPLESS GAS SYSTEM COMPATIBLE - Designed to work seamlessly with modern capless fuel systems for hassle-free use.

STP Octane Booster is a powerful 2-in-1 formula that boosts octane by up to 2 points while cleaning your fuel intake system. Compatible with capless gas systems, it reduces engine knocking and restores lost horsepower, making every fill-up an opportunity to enhance your vehicle’s performance and acceleration.

Specifications

ASIN	B004MBFTYK
Best Sellers Rank	#25,799 in Automotive ( See Top 100 in Automotive ) #161 in Oil & Fluid Additives
Brand	STP
Customer Reviews	4.6 4.6 out of 5 stars (1,296)
Date First Available	14 August 2012
Item Weight	150 g
Item model number	78574
Manufacturer	STP
Manufacturer Part Number	78574
Model	Octane Booster
Position	Outside
Product Dimensions	3.81 x 5.84 x 20.32 cm; 150 g
Voltage	12 Volts

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