Colorado vs Oklahoma gas prices
Regular gas is $0.42 a gallon cheaper in Oklahoma — $6.28 on a 15-gallon fill-up. The two share a border, so that gap is worth knowing before you cross it.
Oklahoma| Grade | CO | OK | Diff. | |
|---|---|---|---|---|
| Regular | $4.13 | $3.71 | $0.42OK | Oklahoma |
| Midgrade | $4.54 | $4.12 | $0.42OK | Oklahoma |
| Premium | $4.87 | $4.42 | $0.45OK | Oklahoma |
| Diesel | $5.18 | $4.79 | $0.40OK | Oklahoma |
Where the $0.42 gap actually comes from
21% of it is tax. Colorado charges $0.09 more per gallon in federal and state taxes than Oklahoma. The remaining $0.33 is a real difference in what the fuel, refining and distribution cost — refinery proximity, pipeline access and state fuel-blend rules.
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 $0.42 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 Colorado or Oklahoma?
Regular gas is cheaper in Oklahoma, at $3.71 a gallon against $4.13 in Colorado — a gap of $0.42, or 11.3%. On a 15-gallon fill-up that is $6.28. Figures are AAA daily state averages for 2026-08-02.
Why is gas more expensive in Colorado?
21% of the $0.42 gap is tax rather than the cost of the fuel. Colorado levies $0.09 more per gallon in federal and state taxes; the remaining $0.33 is a genuine difference in what the fuel, refining and distribution cost.
Is diesel cheaper in Colorado or Oklahoma?
Diesel is cheaper in Oklahoma at $4.79 a gallon, against $5.18 in Colorado — $0.40 a gallon apart.
Is it worth crossing from Colorado into Oklahoma to fill up?
If you are already near the line, yes: a 15-gallon fill saves about $6.28. Driving out of your way for it rarely pays — at $4.13 a gallon and 25 mpg, a 19-mile round trip would eat the whole saving in fuel alone, before your time.