I do believe there are even more quick service places that take the TIW card now.
We always ask where ever we eat. Never too proud to save money.
The Boss sat down with Deb's menus and estimated what we should pay to eat every day, based on the QS that we planned on eating in, where we had reservations, tips, and tax.
She then compared that to what it would cost us using the DDP and just paying with the TIW.
The way we eat, it came out much cheaper with the TIW card. We also ate less, and, manage not to gain weight on our trip (ok...not very much anyway).