[RipNC]

It varies wildlydepending on company and location. In early April I saved almost $1/gal (mostly because GA had suspended state tax) and recently saved only ten cents per gal. TA/Petro are usually among the better priced, but we also have had some luck with Casey's, Thornton's and Weigel's. Typical savings are between 25-50 cents off truck stop pricing so sometimes cheaper to buy from regular stations when not towing (we use GasBuddy app to compare to TSD/EFS).

We use the app to look ahead and pick my fuel stops. Prices have been changing daily (up and down) so we try to check the app in the morning before we travel.