Drivers in Oklahoma, Missouri, South Dakota, North Dakota, Nebraska, Minnesota and Kansas: be ready. GasBuddy, the leading fuel savings platform saving North American drivers the most money on gas, today predicts that gas prices in these states will spike anywhere from 50¢ to $1 per gallon over the next several days. While there are few details on the particulars on what is driving the increase, trade sources tell GasBuddy a refinery outage may be to blame.