After reading about the utterly preposterous Magic Power System Power Shift Bar, a reader pointed this thing...
...out to me.
Regrettably, the fifty-dollar "MizerPod" will not give you more horsepower, electronically clean your car, render you invisible to radar or repel parking enforcement officers.
What it will do - when you can actually buy one, which you apparently can't quite yet - is beep at you when it detects more than slight "longitudinal acceleration" - speeding up or slowing down.
To avoid the beeps, you'll have to drive more smoothly. Drive more smoothly and you'll use less fuel. And there you go!
Regrettably, I don't see any reason to suppose that the MizerPod's "state of the art MEMS semiconductor accelerometer technology" has any way to tell the difference between acceleration and merely going up, or down, a hill. If you live in San Francisco, I presume it'd never shut up.
And real men use an Ozzy Osbourne Inertial Penalty Horn, anyway.
(Now would probably be a good time for car manufacturers to reintroduce the
good old "economy meter", which actually just measured manifold vacuum. Modern cars have a manifold pressure meter anyway, so it could just be one more electronic gauge to make the driver feel even more like an astronaut.)