In June 2009, the US national average price of a gallon of regular gasoline was $2.631 - equal to about $2.67 per gallon in 2010 dollars.
The price of gasoline in June 2009 was $2.69/gal
1.00
As of June 9, 2010, the average price of a gallon of regular gas in Missouri is $2.518
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 average per-gallon price of regular gas in Orlando is $2.584
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 average price for a gallon of regular gas in Atlanta is $2.571
I'd say about the middle of June, 2008.
As of June 9, 2010, the average price per gallon for regular in Nevada is $2.881
It depends on if you are referring to the world or Country average price or a specific state.
In June 1986, the US national average price of a gallon of regular unleaded gasoline was 95.5 cents - equivalent to about $1.91 per gallon in 2010.
As of June 2014, the price for gas in Toronto, Canada in US dollars is $1.26 per liter. The price per gallon would be equivalent to $4.76 USD.