The weather will be dropping to a whooping -40 to -50 degrees this week. Will this product prevent the lines from freezing?

Yes since it is fuel modifier that make gas better and it removes water to. But at -40 an Can HEAT can do it better.

will adding this to regular gas improve it to premium gas ?

Sorry but no, it will improve your gas quality, by removing water deposits, increase has mileage, and a slight octane booster.

Will this work on a Toyota Corolla 2016?

This product should work on the vehicle mentioned in the question. However, I purchased the STP Water Remover which will work on your '16 Toyota Corolla. The water remover is in a yellow bottle, not red. Hope this answer helped you out.

Is this different than fuel injector cleaner? Could it help get rid of rough idling?

Yes they are different. Rough Idling can mean an engine issue. Having it checked now could save a larger expense later.

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STP 78578 5.25 Ounce, Gas Treatment (5.25 Fluid Ounces) (Pack of 2), 14413

Product ID: 284410926

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Details

Brand
STP
Colour
Multicolor
Material
Plastic
Auto part position
Unknown
UPC
071153785786

💰Saves gas

❄️Prevents freeze

🛢️5.25 oz

Description

Fuel your journey, not your worries! ⛽️

💼 ECO FRIENDLY CHOICE - Save gas and reduce emissions while driving.
🔄 CAPLESS COMPATIBILITY - Designed to work seamlessly with capless fuel tanks.
🌡️ WINTER READY FORMULA - Prevents fuel line freeze, ensuring reliable starts in cold weather.
🚀 BOOST YOUR FUEL EFFICIENCY - Keep your fuel intake system clean and efficient.
🛡️ PROTECT AGAINST DEPOSITS - Prevents harmful deposit buildup for a smoother ride.

The STP78578 Gas Treatment is a powerful 5.25-ounce solution designed to enhance fuel efficiency, prevent deposit buildup, and protect against fuel line freeze. Compatible with capless fuel tanks, this treatment not only saves you money at the pump but also contributes to a cleaner environment. Packaged in a convenient two-pack, it's the perfect addition to your vehicle maintenance routine.

Specifications

Global Trade Identification Number	00071153785786
Manufacturer	STP
Product Dimensions	15.24 x 7.62 x 12.7 cm; 317.51 g
Item model number	78578
Manufacturer Part Number	78578
Item Weight	318 g

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