Based on the Gas Prices (State Prices) shared by AAA Fuel Gauge Report, Oklahoma has the cheapest prices for gasoline. As of today February 8, 2016, Oklahoma Fuel Prices is at $1.415 (Regular); $1.613 (Mid); $1.796 (Premium); $1.675 (Diesel).
Followed by:
Missouri Current Avg: $1.431 (Regular) $1.652 (Mid); $1.879 (Premium); $1.723 (Diesel)
Kansas Current Avg: $1.471 (Regular); $1.641 (Mid); $1.854 (Premium); $1.805 (Diesel)
Indiana Current Avg: $1.476 (Regular); $1.736 (Mid); $2.010 (Premium); $1.974 (Diesel)
Ohio Current Avg: $1.496 (Regular); $1.770 (Mid); $2.038 (Premium); $2.033 (Diesel)
Michigan Current Avg: $1.517 (Regular); $1.805 (Mid); $2.092 (Premium); $2.011 (Diesel)
Please note that prices may vary as it changes daily.
As per CNBC, the lowest prices tend to be in places close to refineries, but particularly close to the cheap domestic crude. Oklahoma is the beneficiary of cheap domestic crude as are the Rockies and much of the great plains right now. They also have a low tax structure.
The state's refineries use lower-priced oil than many East, West and Gulf Coast refineries. There are five refineries in Oklahoma that together process about 520,000 barrels per day of crude—oil that doesn't have to come far and is far cheaper than the coasts.
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