Global oil prices fluctuate wildly - this month they're down from $140 per barrel to $95 in September. But pump prices aren't falling nearly as fast as they went up a few months ago. The message is clear - none of us is immune from the vagaries of the oil market. But now there is a way of slashing your fuel bills dramatically. In the past few months over a million drivers have purchased instructions on how to build and fit your own hydrogen generator that can DOUBLE your mpg in some cases.

If you can handle a screwdriver and a few simple tools you are halfway to building your own hydrogen generator that will save you THOUSANDS of dollars per year in gasoline or diesel costs.

The theory has been known for many years, but only recently has it been possible to build a lightweight system such as this to totally transform the way your car burns fuel, to make it run more smoothly and much more efficiently.

Since the oil priced rocketed earlier this year there have been several additions to the stable of hydrogen generation products. Some of them are better than others, so it's important to choose the right one.

We reviewed eight products - only 3 met our criteria: It must give clear, easy to follow instructions You don't want to be standing there, scratching your head, wondering what to do next It should offer a good level of support and provide a good collection of supporting material If you should need help - you want it to be there 24/7 It should offer good value of money and offer a money-back guarantee If you are not totally satisfied, you need to be able to get your money back, no questions asked.