RV Fuel Issues & Prices - Post 'Em Here!

Yesterday gasoline prices leaped up 20¢+ to $4.19 a gallon (one station at $4.35) at many stations. Seems that two refinery's in the Chicago area shut down for maintenance. I'm curious as to why, being about 300 miles away, our gasoline prices increased. Across the river there is a refinery where we get our gasoline. Seems to me that we, the consumer, is getting it the shorts, again :E. This "massive" increase is a "sneaky" way increase someone's profit margin.