In 1923 itself, the average price was $0.22 per gallon.
The price per gallon of gasoline in 1914 was about $.17/gallon.
The price of a gallon of gas in 1990 varied from $1.10 to $1.30
the average price per gallon of gas in 1988 was $1.08
In 1979, the average cost for a gallon of gas was $0.86.
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
the average gas price for a gallon was $1.85 in the year of 1994.
About .20/Gallon
As of June 9, 2010, the average price of a gallon of regular gas in Missouri is $2.518
1/2 gallon of gas
$ .99 cents a gallon