Gasoline's Long Price Climb
27 February 1975 Mrs. "Prospective Tenant" from Barney Miller episode 1.6 "Stakeout" complained that gasoline was 69 cents/gallon.
23 April 2005 I paid $2.09 for a gallon of gas (source).
21 April 2006 Marketplace reports gasoline at $4.00/gallon in Beverly Hills, California.
The chart at left comes from the US Department of Energy. Might be a handy thing to keep an eye on in the next few months.