About Comdata and T-Chek averages:

Comdata, formerly NTS Inc., average prices are primarily from self-service stations but also include some full- and mini-service operations. The seven-day average is based on Comdata cash card transactions from more than 3,200 truck stops throughout the United States and Canada. All taxes are included.

T-Chek prices are Monday-through-Friday averages. The retail price is based on self-service purchases at more than 4,500 truck stops and includes all taxes.

The T-Chek wholesale price is based on terminals and suppliers from 308 cities throughout the United States.