... , yawn. Repeat. With a quick glance down at your mug, you can tell if you need a quick top-up ... with more sweet sweet nectar. Our new Tank-Up mug is more than capable of handling a 16 ounce hot ... coffee, then bleeds back to black as you drain the mug. Time for more fuel. Gotta head back to the ... plains of Nevada. Features and Stuff Clean white ceramic mug Heat-sensitive fuel gauge turns red as you fill it ...