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, at stations surveyed on Mondays and published Tuesdays around 10am ET.

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

We run an automated pull every Tuesday evening, after EIA's publish window closes. Before anything ships, the new numbers go through validation: is the price in a plausible range, is the feed stale, and how far did this week's number move from last week's. If any check fails, the site keeps last week's verified data instead of publishing something wrong. If everything passes, the site rebuilds automatically — no manual step, and bad data can never silently publish.

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 pull it on the same quarterly cadence and run it through the same validation discipline as the EIA feed: range checks, staleness checks, and a diff against the prior quarter before anything goes live on a calculator or state page.

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.