Gas is no longer available in Tuolumne Meadows. Gas is available at Wawona, Crane Flat, and El Portal 24 hours per day with a credit card. If you do use a GPS unit, just keep in mind that if there's a conflict between what the road sign says and what your GPS unit says, the road sign is correct (and your GPS unit isn't). We do not recommend using GPS units for directions in and around Yosemite.
Yosemite covers 1,200 square miles and does not have a single address. Please note that GPS units do not always provide accurate directions to or within Yosemite.