(WXYZ) — Gas prices in Michigan and across the Midwest could rise to more than $4.50 per gallon this week, according to the latest update from GasBuddy. Patrick De Haan, the head of petroleum analysis for GasBuddy, posted on X that Great Lakes states could see a double spike this week because of refinery challenges in the region which is causing a large surge in wholesale gas prices. De Haan said that those wholesale gas prices are now about 40 cents above their early April leve.