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.17 cents a gallon.
At the beginning of 1920, the average price of gasoline in the United States was 17 cents per gallon. However, the gas shortage occurred in 1920, and as such, the average price of gas rose to about 30 cents a gallon in less than 6 months during 1920.
The price of a gallon of gas in 1990 varied from $1.10 to $1.30
I looked for this answer and there is no gas price listed for 9 cents. It goes too far back to the very start of cars. The earliest date I found was 1920 and the price was .18 cents a gallon.
In 1920 the price of a gallon of gasoline was around .18 cents. But that .18 cents is equal to $2.05 in todays money.
the average price per gallon of gas in 1988 was $1.08
The price per gallon of gasoline in 1914 was about $.17/gallon.
the average gas price for a gallon was $1.85 in the year of 1994.
In 2005, the average price per gallon of regular unleaded gas was $2.30
In 1997, the average price per gallon of regular unleaded gas was $1.23
About .20/Gallon
As of June 9, 2010, the average price of a gallon of regular gas in Missouri is $2.518