Increase your vehicle's MPG by up to 20%, slash fuel costs and reduce your carbon footprint! A great way to fight back against greedy oil companies and greenhouse gases! And with a gas price rising, it pays for itself in just 3-4 weeks! Fuel Doctor Platinum reduces electrical noise in your vehicle's power system including fuel injection systems, which improves fuel efficiency. By enhancing the firing of your engine, gas mileage is greatly increased. And because you use less gas, you reduce your carbon footprint! Easy to use - just plug it into your vehicle's 12V lighter socket and drive! It really works and won't damage your vehicle. Cannot be used on hybrid or electric cars. 1-year limited warranty.