This high tech driving buddy is a car wonk's dream. A trip to the supermarket serves up a feast of gearhead stats, including 060 time and detailed readouts of horsepower, torque, and G forces. And if you don't end up a better driver, don't blame the G-Tech: A light signals optimal up-shifts, and the device records two hours of performance info you can analyze on your computer using the Tesla software. Best of all, the unit requires no installation — plug it into the cigarette-lighter port and it immediately gets busy gathering RPM data.
$300, gtechpro.com
