Average retail gasoline prices in Missouri have risen 20 cents per gallon in the past week, averaging $3.76 per gallon as of Sunday, May 19, according to gasoline price website GasBuddy's daily survey of 3,940 gas outlets in Missouri. Nationally, fuel prices rose 8.9 cents to $3.67 per gallon, according to GasBuddy.com. Including the change in gas prices in Missouri during the past week, prices yesterday were 32.6 cents per gallon higher than the same day one year ago and are 42.4 cents per gallon higher than a month ago. The national average has increased 16.6 cents per gallon during the last month and stands 3 cents per gallon lower than this day one year ago. "The last seven days have delivered some shocks at the pump for motorists in the nation's Midwest," said Patrick DeHaan, GasBuddy.com senior petroleum Analyst. "Gas price records in these areas aren't being quietly replaced, they're being blown out of the water," DeHaan added. "I don't believe I've ever seen such crazy trends in gasoline prices occur all at once — prices spiking in one area, falling in another, and holding steady in others. What we're seeing today is certainly rare." File Photo Gas Pump