Gasoline in the U.S. has certain minimum standards.
As such all gasoline is exactly the same in that
respect. Some gas companies will add certain
additives to their gasoline that supposedly will do
certain other things they claim improves their gas
over others. However, this is not a fact.
With the exception of the grade difference in gasoline
all gasolines do exactly the same as others. What
can make a difference is in the way your car may
handle the additives. One brand of gasoline may seem
to perform better than another, but this is only due to
the way your car is tuned, the size of your carburetor
jets, or the fact that your injectors may not handle
the different additives as well after running another
brand for a good while. If this latter is the case, just
use a good injector cleaner in your gas for a while, and
it should clear that part up for you.
Other than these things, no gasoline is actually any
better than another, and to buy cheaper gas is not
buying a cheaper quality product. Some people say
that one brand, or station 'waters down' their gas.
This is not true! State inspectors check the quantity,
and quality of gas on a regular basis. If someone
suspects a problem in the gas, or the station, they
can call the state (info listed on all gas pumps with
the state inspection sticker) and make a complaint.
That station will be checked again on the basis of the
complaint, and without any information given to the
station on the complainant, or the complaint itself.
All gas storage tanks do have a problem of condensation
inside the tanks. As a result there can be a build up of
water in the tank. However, this water remains in the
bottom of the tank as gas floats on water. The water is
never mixed into the gasoline. Stations are required to
do a water check test regularly. When a lot of water
has accumulated in their tank they cannot get as much
gas in the tank to sell. They would then contact a
company to pump that water out.
Where most people get water in their gasoline is due
to the condensation in their own gas tank in the car.
That is one of the reasons that ethanol is added to the
gasoline by the petroleum companies. (It also makes
them more money to use a little alcohol, and less
In winter months it is suggested that a person keep
their gas tank no less than half full. This tends to
prevent the condensation. Filling the tank as soon as
the gauge shows half a tank can keep the moisture
at a very minimum level. Should you have a problem
of gas line freeze during the winter, or wish to prevent
it, you don't have to buy anything special in the way of
a gasoline antifreeze. All you need to use is some
regular Isopropol Alcohol. (Regular rubbing alcohol that
you can get at any pharmacy, and many other places.)
This comes in a 16 oz bottle, but you don't need to use
a whole bottle. I prefer to use half a bottle in a tank of
gas. This product can also unfreeze a frozen gas line
for you to drive after only a few minutes work in putting
it in, shaking the car to mix the alcohol in the gas, then
making several attempts to start the car after a few
minutes. (This causes the fuel pump to push the
alcohol gas to, and through the frozen line to the
combustion chamber.) At times in the past I have
had to work with a frozen line from just three or four
minutes with a partial freeze, to about 45 minutes with
a solidly frozen line. (incidentally, the Army buys 55 gal.
drums of this alcohol to pump into quart cans for units
to use. I still have some of the quart cans of Isopropol
Alcohol. (gov issue)