Besides being the most radical-looking shift knob on the planet, the Gaslock Indy Cater has an energy-saving function. It tells you the exact point to shift to save gas, and if you follow its timely shifting tips, you can end up spending 15% less on fuel. It's not going to give you astonishing mileage like that 200 mpg Velozzi hybrid we showed you yesterday, but still, 15% savings might come in handy. Its auto-dimming LEDs adjust to ambient light so they won't be too distracting, and the shifter also has a helpful numerical indicator that reminds you what gear you're...