About $2.70 per gallon in the US.
In 1974, the average cost of a gallon of regular gasoline (which was leaded in '74) was 53 cents. In 2010 (as of June 8, 2010) the average price of a gallon of regular unleaded gasoline is $2.718. However, that 53 cents figure from 1974 is the equivalent of about $2.34 per gallon in 2010 dollars.
From June 2013 to June 2014, average gas prices in Washington State generally ranged from about $3.70 to $4.30 per gallon. Prices experienced fluctuations due to seasonal demand, refinery issues, and changes in crude oil prices. Notably, the average price peaked during the summer months, reflecting increased travel and consumption. Overall, Washington State consistently had higher gas prices compared to the national average during this period.
In 1974, the average cost of a gallon of regular gasoline (which was leaded in '74) was 53 cents. In 2010 (as of June 8, 2010) the average price of a gallon of regular unleaded gasoline is $2.718. However, that 53 cents figure from 1974 is the equivalent of about $2.34 per gallon in 2010 dollars.
As of June 9, 2010, the average per-gallon price of regular gas in Orlando is $2.584
As of June 9, 2010, the average price of a gallon of regular gas in Missouri is $2.518
About $2.80 per gallon in the US as of June 1, 2010.
As of June 9, 2010, the US national average price of a gallon of regular gas is $2.713
As of June 9, 2010, the US national average price of a gallon of regular gas is $2.713
In 2007, the US national average price of a gallon of regular gasoline was $2.80. That is equal to about $2.94 per gallon in 2010 dollars.
In 1997 gas prices ranged from around $1.30 to $1.50.
In 2001, the US national average for a gallon of regular gasoline was $1.46 - the equivalent of about $1.80 per gallon in 2010.
According to the following website, gas prices appeared to be around $1.95 in 2000: http://flowingdata.com/2007/07/12/gas-prices-over-time-2000-2006/