Updated April 29, 2026 - EIA Weekly Survey
Diesel Cost per Gallon in Idaho (2026)
$5.43/GAL
-0.16 vs US average ($5.59)Rank #30 of 50 statesPADD 4
Diesel Tax Breakdown
Federal diesel excise tax24.4c/gal
Idaho state diesel tax32.0c/gal
Total tax56.4c/gal
Tax as % of price1039%
Sources: Federation of Tax Administrators, EIA. Rates as of April 2026.
CALCULATE YOUR FUEL COST IN IDAHO
Use our trip calculator prefilled at $5.43/gal for Idaho.
Sources: EIA Weekly On-Highway Diesel Fuel Survey, AAA Gas Prices (gasprices.aaa.com), Federation of Tax Administrators diesel tax table. Updated April 29, 2026. State prices are representative averages; actual pump prices vary by retailer and location.