I just got the TCS card in the mail today. It is a self funded card, like a debit card. You can only use the dollar amount that you put into it. The only way to find out how much their fuel discounts are is by getting a card. After that they set you up with the account and only then do you get access to their fuel stops. So far the average I have seen along the routes I normally travel is about a 13 cent savings over the pump price. Better than the RV Plus card from Good Same but you have to remember to keep a balance on the TCS card to use it.
Not sure if I like this arrangement or not. Also if you do not use the card for 90 days there is a $10 service fee.
Where does one find out about the TSD card?