Data Sources

EIA — U.S. Energy Information Administration

The Gasoline and Diesel Fuel Update is EIA's weekly retail price survey. It covers on-highway diesel, all grades, and reports Monday prices. EIA normally publishes Tuesday around 10am ET; when Monday is a federal holiday, publication moves to Wednesday.

Prices break out by PADD region — the five multi-state petroleum districts the government has tracked since WWII-era rationing — plus a national average.

Scheduled checks run Tuesday, Wednesday and Thursday. Before publishing new or revised data, we check that the national average and all five PADD regions share the same survey date, with complete records, valid dates and reasonable prices and changes. Thursday's check requires the current week's Monday data. While a release is unavailable or validation fails, the site keeps the latest verified dataset and shows its survey date.

IFTA Inc.

The IFTA Inc. tax matrix is the official quarterly rate table published for every member jurisdiction under the International Fuel Tax Agreement — the lower-48 states plus the Canadian provinces that participate.

We refresh the current quarter's rates weekly to capture revisions, checking the source quarter, rate ranges and all 48 US member states before publishing. Prior quarters are retained from the official historical exports, so the estimator can use the return period you select. Confirm final rates with IFTA Inc. before filing.

ATRI — American Transportation Research Institute

The American Transportation Research Institute publishes the industry's annual operational-cost benchmark report. We cite it here and there as reference context — an industry-wide backdrop — never as a substitute for the numbers you get from running your own truck through our cost per mile calculator. Averages describe the industry; they don't describe your fixed costs or your miles per month.