The recent hysteria over dramatic raises in gas prices have led consumers to try any possible method to increase their vehicle’s fuel efficiency. This includes buying gasoline saving products, many of which are very unproven and may only improve gas mileage a little bit. When buying these products, keep in mind that the price of the product itself may as well be added to your fuel prices, and you’ll have to save quite a bit of gas to offset this new expense. Also, the EPA has tested many such products, finding that none so far have caused much of an increase in gas mileage.