[LukeZero]

I doubt it works that well. A continuous 10A load will make the alternator work harder, which will require more fuel, which, once you account for friction losses and conversion losses will end up being a net loss in gas mileage. You cannot, from a purely physics standpoint- get more energy out than you put in. Unfortunately, there is no free lunch. If there was, it would perpetual motion.

Every time there is a spike the the price of fuel- there are all these "hokey" products that claim to increase mileage.

1. Tornado air stirrer-upper thingey that fits inside air cleaner.
2. Magnets that clamp to the gas line to "magnetize the fuel".
3. Tablets that go in the fuel tank and "condition the fuel".

To my knowledge, none have been shown to have any effect other than the weight it removes from your wallet.