What is the mixing ratio of this particular product, since I understand there are 2 different strengths. Thanks!

There are two different strengths. The more concentrated mixture usually has a silver bar (with varying words) across the center of the label but that's just my observation, not guaranteed. The strength ratio is odd: stronger is 2.66 times normal and is more economical.For THIS product, you should add 1 ounce for every 6 gallons of fuel, stated on the label. The label also states that adding too much is not harmful.

Can you add this to the gas can that may sit unused for months?

We’ll you could. However, I would not use any gas that has been stored for several months. I recommend only get what you will use in a couple of months and not store unused gas for several months

Should you pour it into a tank with fuel in it? I know ideally you should use it before a fill-up but if my car is sitting with gas in the tank, will

Depends on the configuration of your gas tank and the fuel filler neck. If it makes a lot of turns all the product might not reach the tank and would be suspended in the filler neck. In the situation you describe I would mix the Star Tron in a small 1 or 2 gallon container with gas and pour the entire contents into your tank.

Is this unit easy to use?

Yes it is easy. Follow the directions. Pour a measured amount into the amount of gasoline. The measurements are on the side of the star tron container

143 Series Regular Gas Formula | Desertcart Austria

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Fuel your engine’s comeback story with Star Tron!

WATER WRECKER - Prevents water build-up by breaking it into harmless droplets for smooth operation.
FUEL ECONOMY BOOSTER - Clean fuel delivery system means more miles per gallon, every time.
ENGINE REVIVAL MASTER - Unlock effortless starts and peak performance even after long idle periods.
UNIVERSAL ENGINE ALLY - Works seamlessly with all engine types and fuel blends—car, boat, RV, or mower.
ETHANOL PROBLEM SLAYER - Eliminate rough idling and fuel economy drops caused by ethanol blends.

Star Tron Enzyme Fuel Treatment leverages cutting-edge enzyme technology to stabilize fuel for up to 2 years, prevent ethanol-related engine issues, and disperse water in fuel systems. Trusted by thousands and compatible with all engines and fuel types, it ensures smoother starts, cleaner combustion, and improved fuel economy—making it the go-to additive for professional-grade engine care.

Specifications

ASIN	B00EXIVUMM
Best Sellers Rank	#2,033 in Automotive ( See Top 100 in Automotive ) #6 in Fuel Additives
Brand	STAR BRITE
Customer Reviews	4.7 4.7 out of 5 stars (3,302)
Date First Available	August 26, 2013
Item Weight	8.5 ounces
Item model number	14308
Manufacturer	Star brite
Manufacturer Part Number	14308SS
Model	Star Tron Enzyme Fuel Treatment - Classic Gas Formula
Product Dimensions	2 x 3 x 7.25 inches

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€ 38.23

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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