In MN Regular is E10 (10% ethanol) while Plus is E15. Often Plus is the same price as Regular. One would think that would be a good deal. More octane for the same price. Unfortunately we have found that you get worse gas mileage running E15 verses E10.
You get the best gas mileage running Premium in MN which is E0. The gas station owner runs Regular around town in his Suburban but on trip he will run Premium. The better gas mileage more than makes up for the price.
So in MN running Plus instead of Premium will more than likely cost more in $/mile.
