At 27.2 minutes, the current cost of gas in minutes worked to drive 100 miles is the lowest since 1999 (26.3 minutes).

Tuesday afternoon links » AEI:
"1. Chart of the Day.
Incorporating the combined effects of: a) the increase in average fuel economy over time, b) the increase in the average hourly wage, and c) falling gas prices, the chart above shows the number of minutes of work required to buy enough gasoline to drive 100 miles. 
At 27.2 minutes, the current cost of gas in minutes worked to drive 100 miles is the lowest since 1999 (26.3 minutes). "