Gas Myths
There are many gas myths out there. Most of them pertain to supposed events at gas stations or how consumers can control the price of gas by altering their buying habits.
Boycotting a couple gasoline brands will bring overall gas prices down
This myth suggests that by refusing to purchase gas from the two or three biggest gas companies they will see a decline in sales and have to reduce their prices to start selling gas again. Then the other companies will have to lower their prices to remain competitive.
There are a couple of reasons why this isn't true. For starters, a boycott of certain brands of gas wouldn't result in lower prices overall. The prices at the non-boycotted stations would actually be likely to go up because of the temporarily limited supply and increased demand for their product. The only way for consumers to increase the likelihood of a decrease in gas prices is to lessen the overall demand for gasoline, not just making their purchases in certain stores. Also, gas companies sell their product at gas stations other than the ones that promote their brand, so it gets very complicated to figure out what company the gas that you are actually buying is coming from.
Participating in a one-day "gas out" will help bring the retail price of gas down.
This myth suggests that if everyone in the US didn't purchase gasoline for one certain day the oil companies would choke on their stockpiles.
Again, same basic reason for why this is a myth - gas is still subject to supply and demand - only a significant, continuous reduction in demand will actually lower the price in the long run. Also, the only people who would actually be hurt by this gimmick is the service station operators - so it wouldn't accomplish anything anyway.