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.

Stp All Season Water Remover Treats 21 Gallons 5 25

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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59183CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗💨 Keep your ride unstoppable, all year long!

CORROSION DEFENSE - Protect your fuel system from damaging rust and corrosion with every use.
FREEZE PROOF FUEL FLOW - Say goodbye to winter fuel line freeze and keep your engine running smoothly no matter the season.
UNIVERSAL COMPATIBILITY - Works seamlessly with cap-less gas systems, making it perfect for modern vehicles.
ALCOHOL FREE WATER REMOVAL - Effectively removes water without harsh alcohol, preserving fuel quality and engine health.
INJECTOR PERFORMANCE BOOST - Maintains clean fuel injectors for optimal engine efficiency and power.

STP Water Remover is a powerful all-season fuel additive designed to prevent fuel line freeze, combat corrosion, and remove water without alcohol. It keeps fuel injectors clean and maintains peak engine performance, compatible with cap-less gas systems. Packaged in convenient 5.25 fl oz bottles, this 12-pack ensures your vehicle stays protected and efficient no matter the weather.

Specifications

ASIN	B00C183QKU
Best Sellers Rank	#16,728 in Automotive ( See Top 100 in Automotive ) #42 in Fuel System Cleaners
Brand	STP
Customer Reviews	4.6 4.6 out of 5 stars (161)
Date First Available	March 12, 2013
Item Weight	1 ounces
Item model number	78572-12PK
Manufacturer	STP
Manufacturer Part Number	78572-12PK
Model	78572-12PK
Product Dimensions	8.3 x 7.1 x 6.2 inches
Voltage	12 volts

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