Sometime before the 1930's Because when I was a child I remember gas station signs advertising 6 gallons for $1.00.
That was 1979.
In the 60s.
18.4 cents per gallon for gas; 24.4 cents per gallon for diesel.
In the US, the one year where prices averaged close to 40 cents per gallon was 1973. That year, the average price per gallon was 39 cents, equal to about $1.91 per gallon in 2010.
Around 1976 gas prices in Massachusetts was 50 cents per gallon.
gas was 42.9 cents per gallon
In late 1978.
1998 to 1999
Around 30 cents per gallon.
67 cents per gallon.
85 Cents per gallon is cheaper, which is a rate of about 22.43 cents per liter.
1976