From: http://www.eia.doe.gov/bookshelf/brochures/diesel/index.html, June 2008
The Energy Information Administration Does Not Calculate, Assess, or Regulate Diesel Fuel Surcharges
Many transportation companies and freight carriers include a fuel-cost surcharge in their rates and invoices to cover increases in the cost of diesel fuel.
EIA cannot tell you how to calculate a fuel surcharge. Fuel surcharges are negotiated privately by the shipper and the trucking company.
Every company has its own method for calculating surcharges. Many major carriers have information on how they calculate their surcharges on their websites. EIA cannot and does not endorse a particular method, but you can perform an Internet search for "fuel surcharge trucking" for more information.
EIA collects and disseminates weekly retail diesel fuel price data. Many shippers and truckers use that weekly retail price information in their fuel pricing formulas.
Stay up-to-date on weekly retail on-highway diesel prices.