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 For Gasoline Fuel Additive Restore Lost Power

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⛽ Power Up Your Drive, Clean & Mean!

TRUSTED PROVEN - Ranked #3 in Octane Boosters with 4.5-star rating from over 1,400 users.
FUEL TANK FRIENDLY - One 5.25 oz bottle treats up to 15 gallons, perfect for regular maintenance.
DUAL ACTION FORMULA - Simultaneously raises octane and cleans your fuel system for peak engine efficiency.
COMPACT CONVENIENT - Slim 1.5 x 2.3 x 8 inch bottle fits easily in your glove box or garage shelf.
EFFORTLESS POWER BOOST - Just pour before refueling—no mixing needed for instant performance uplift.

STP Octane Booster is a premium 5.25 oz fuel additive designed to enhance gasoline octane levels and clean the fuel intake system, restoring lost engine power. Easy to use with no mixing required, one bottle treats up to 15 gallons of fuel, making it ideal for regular use. Highly rated and trusted, it’s a must-have for maintaining optimal vehicle performance.

Specifications

ASIN	B004MBFTYK
Best Sellers Rank	#7,747 in Automotive ( See Top 100 in Automotive ) #3 in Octane Boosters
Brand	STP
Customer Reviews	4.5 4.5 out of 5 stars (1,417)
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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