Missouri vs Oklahoma gas prices
Regular gas is $0.08 a gallon cheaper in Oklahoma — $1.20 on a 15-gallon fill-up. The two share a border, so that gap is worth knowing before you cross it.
Missouri
Oklahoma| Grade | MO | OK | Diff. | |
|---|---|---|---|---|
| Regular | $3.79 | $3.71 | $0.08OK | Oklahoma |
| Midgrade | $4.16 | $4.12 | $0.04OK | Oklahoma |
| Premium | $4.51 | $4.42 | $0.09OK | Oklahoma |
| Diesel | $4.87 | $4.79 | $0.08OK | Oklahoma |
Where the $0.08 gap actually comes from
All of it is tax, and then some. The fuel itself is dearer in Oklahoma before tax — by $0.02 a gallon — yet it is still $0.08 cheaper at the pump, because Missouri levies $0.10 more per gallon. Policy is doing all of the work here and overcoming a product disadvantage on the way.
Fuel, refining, distribution and marginFederal and state taxes Pre-tax figures are estimates — see the note below.
What the gap is worth
Based on today’s $0.08 per-gallon difference, which moves week to week. Use the fuel cost calculator for your own mileage and vehicle.
Prices by metro area
State averages hide a lot. These are the cheapest metros AAA reports on each side.
Other comparisons
Frequently asked questions
Is gas cheaper in Missouri or Oklahoma?
Regular gas is cheaper in Oklahoma, at $3.71 a gallon against $3.79 in Missouri — a gap of $0.08, or 2.2%. On a 15-gallon fill-up that is $1.20. Figures are AAA daily state averages for 2026-08-02.
Why is gas more expensive in Missouri?
Entirely because of tax. Oklahoma actually pays more for the fuel itself — $0.02 a gallon more before tax — but Missouri levies $0.10 more per gallon, which more than reverses the advantage.
Is diesel cheaper in Missouri or Oklahoma?
Diesel is cheaper in Oklahoma at $4.79 a gallon, against $4.87 in Missouri — $0.08 a gallon apart.
Is it worth crossing from Missouri into Oklahoma to fill up?
If you are already near the line, yes: a 15-gallon fill saves about $1.20. Driving out of your way for it rarely pays — at $3.79 a gallon and 25 mpg, a 4-mile round trip would eat the whole saving in fuel alone, before your time.