Gas Prices?

I had to run an errand to Deb's place of employment, she having forgotten something she needed. On my way there I noticed that gas prices had changed.

I had filled up the trust F150 a week ago at the local BJ's, shelling out $3.329 per gallon. As I passed by there on my way home after dropping off Deb's stuff, I saw that gas was now at $3.519. That's a 19¢ increase in one week.

Did I miss anything of great import that would have caused gas prices to go up by that much in a week?