If you drive a car with a manual transmission, you use slightly less gas than drivers with automatics. Now you can take this one step further with the Gaslock Indy Cater, a shift knob with an LCD readout that tells you the exact moment to shift in order to maximize your gas savings.
Of course, if you keep your eyes on this thing instead of the road, you might wind up with a bigger problem than losing a few bucks at the pump.
[Via Sci-Fi.com]
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