Add one gallon of the old stuff to your vehicles tank each time you fill up. If the old gas smells like varnish, don't use any of it.
It is all the same, to start with. The different brands have additives added at the bulk plant where the gasoline tankers are filled. Be sure you do not use old gasoline, as the additives are different for winter and summer driving.
Walmart gas comes from the same place everyone gets their gas. The difference is in the additives. All major fuel suppliers use their trademark additives. Walmart may or may not add any additive.
you use additives to preserve your food
Use It
no get new gas
At any gas station you go to, the different grades are just different octane ratings. Despite popular belief, this has nothing to do with fuel quality or fuel additives. You should use the octane rating recommended be the vehicle manufacture.
While the gas is considered "old", it will still work in your lawn mower. It is not recommended that you use old gas, however I prefer not to waste that liquid gold.
There are many fuel additives that you can use that will help your car burn less oil. Using high grade additives can help treat friction in your engine at the the actual source.
The smell additives in gaseous and liquid, odorless fuels, are added to understand if there is a leak. Imagine you have a gas powered stove at your house. you come home fall asleep. You don't wake up the next morning, because of gas poisoning. This would be the case without the smelly additives, with them you know, somewhere is a gas-leak and call the gas service.
The 1998 Subaru Legacy requires regular gasoline without any additives. This vehicle is known to be fuel efficient and runs well on standard gas.
If you put in additives to remove the water and add gas the water will eventually run out of the system. However these additives will only remove a small amount of water caused by condensation or poorly stored fuels. If there is a large amount of water in the tank or the gas is over a year old I would recommend draining the tank better safe than sorry.
You don't. Add not additives to your oil. If additives worked the manufactures would add them to the oil and recommend you also do so.