Idaho · EIA survey Nov 9, 2026
Idaho gas and diesel prices
Regular gasoline $3.946 and diesel $6.206 a gallon this week, including taxes. Idaho is in EIA's Rocky Mountain (PADD 4) region; EIA publishes that region's average rather than a separate Idaho figure.
Price history
Idaho vs. its region and the U.S.
| Area | Diesel | Regular | Premium |
|---|---|---|---|
| Rocky Mountain (PADD 4) | $6.206 | $3.946 | $4.638 |
| United States | $6.127 | $3.995 | $5.013 |
Other states in Rocky Mountain (PADD 4)
Home heating fuels in Idaho
EIA collects residential heating oil and propane prices weekly from October through March (monthly in summer).
Idaho fuel taxes
| Gasoline | Diesel | |
|---|---|---|
| State taxes and fees | 33.0¢ | 33.0¢ |
| Federal excise | 18.4¢ | 24.4¢ |
| Total per gallon | 51.4¢ | 57.4¢ |
| Share of this week’s price | 13% | 9% |
| Rank (1 = highest state tax) | 20 of 51 | 21 of 51 |
State rates: Tax Foundation, July 2026 (state statutes); excludes some local and gross-receipts taxes. Share uses the regional average price. All states.
Driving electric in Idaho
At Idaho’s average residential rate, home charging costs 73% less per mile than gasoline. Public fast charging usually costs more. Run your own numbers.
Quick answers
What is the average price of gas in Idaho?
$3.946 a gallon for regular in EIA's survey of November 9, 2026, the average for EIA's Rocky Mountain (PADD 4) region, which includes Idaho.
What is the price of diesel in Idaho?
$6.206 a gallon in EIA's survey of November 9, 2026 (Rocky Mountain (PADD 4) regional average; EIA does not publish a weekly diesel price for Idaho alone).
Is fuel in Idaho cheaper than the national average?
Diesel is 7.9¢ above the U.S. average, and regular gasoline 4.9¢ below.
What is the gas tax in Idaho?
33.0¢ a gallon in state taxes on gasoline and 33.0¢ on diesel (Tax Foundation, July 2026), plus the federal 18.4¢ and 24.4¢: 51.4¢ and 57.4¢ in total.
What does propane cost in Idaho?
$2.775 a gallon for residential propane in EIA’s survey of November 9, 2026, up 0.3¢ on the week.
Is it cheaper to drive electric in Idaho?
At 13.37¢ per kWh (EIA residential average) an EV getting 3.5 miles per kWh spends about $3.82 per 100 miles on home charging, against $14.09 for a 28-mpg car at $3.946 gas.
Plan a trip or fleet budget with Idaho prices: trip fuel cost · fleet budget. Source: EIA Gasoline and Diesel Fuel Update.