Takes a bit of time to see those prices at the pump change and its always off and hard to figure out too. I remember after hurricane Katrina, oil prices were 60 bucks per barrel and gas prices were 2.89 per gallon 2 weeks after katrina hit (I remember this because i had just got back from vacation in mexico and was only paying about 2.25 per gallon or so there) So using that figure, you can see that if oil hit 120 per barrel, gas prices should've been around 5.78 but they didnt hit that. (and even higher at 147 per barrel oil) Im assuming that they are refining the 140ish per barrel oil now, but taking into account future prices of 90 dollar per barrel oil and trying not to completely shock the public with 7 dollar gas so they charge 50 cents more per gallon for the gas now so it sort of eases the pain of that 140 dollar oil back in july. Dont worry, oil will keep going down and so will gas prices. We will be back at 50 dollar oil again (Although i think alot of people dont believe me on this) but its true and after a sustained period of that, we will have 2 dollar gas prices again.
Gotta feel sorry for those people then that bought those cars from GM (i think it was them) where they promised them 2.99 gas for 3 years. By winter we will be back in the 2.99 range at least.