Mississippi Gas Prices and Why They Are What They Are
Prices as of July 21, 2026, per AAA · Updated July 21, 2026
As of July 21, 2026, regular gasoline in Mississippi averages $3.59/gallon (the 2nd-lowest in the U.S.), per AAA — 0.41 below the national average of $4.00. Diesel averages $4.81. State fuel taxes and fees add 21.4¢/gallon on top of the 18.4¢ federal excise.
Where the $3.59 goes
| Component | $/gallon | Share | Source |
|---|---|---|---|
| Crude oil (national cost, WTI June 2026) | 2.02 | 56% | EIA |
| Federal + Mississippi fuel taxes (18.4¢ + 21.4¢) | 0.40 | 11% | Tax Foundation |
| Refining, distribution, margins & embedded program costs (residual) | 1.17 | 33% | computed |
Crude oil costs every state's refiners roughly the same, so Mississippi's position comes from the tax line and the residual: refining capacity and logistics, fuel-specification requirements, and any carbon or clean-fuel program costs embedded in the pump price.
State policies that show up at the pump
| Policy | Detail |
|---|---|
| Carbon program on motor fuel | No |
| State-specific fuel blend | No |
State government control
| Control today | Unified Republican (Governor + House + Senate, all R) |
| Years of unified Democratic control, 2001–2025 | 3 |
| Years of unified Republican control | 14 |
| Years of divided government | 8 |
Fuel-tax levels and fuel-specification programs are set by legislatures and governors; the national comparison shows average prices and taxes grouped by state control.
Compare: all states ranked · Mississippi electricity rates · gasoline prices by country
Sources: AAA (pump prices, updated daily; the industry-standard 50-state series), Tax Foundation (2026 state fuel taxes), EIA (WTI crude). The residual is computed, not reported. See methodology.