Drivers have likely noticed gas prices have risen dramatically, in recent weeks, adding several dollars to the cost of a fill-up. The national average for regular unleaded is $3.53 a gallon. In Houston, it's $3.11, which is a dime more than a year ago, and $0.25 more, just in the last month.For most people stopping for a fill-up, the rising prices have not gone unnoticed. "They're definitely going up super fast," notes Phillip Edwards.
"All of the refining system wants to run full-out, at 100%," says Lipow, "Every time we experience an unscheduled refinery outage, gasoline prices spike upward, and we see that reflected in higher prices at the pump.