There are many ways to increase gas mileage while driving your vehicle. Gas prices increase or fluctuate on a daily basis and in some parts of the world many people are spending more than twice the amount for petrol. You may have considered buying a hybrid but they still are rather expensive compared to other vehicles. When you keep up on the maintenance of your vehicle you should maintain optimal miles per gallon and scheduling regular maintenance and keeping your vehicle tuned up should keep your engine running optimally. Most new vehicles only require tune ups every one hundred thousand miles. You may not even know when your last tune up was performed if you bought a used car or there are no service records. When you buy used cars from a reputable used car lot you will find that in most cases a tune up has already been performed to that vehicle. Used car dealers do not always do this when servicing a vehicle. When in doubt and you are having some engine difficulties or rough idle or performance has decreased then schedule that appointment. Your best gas mileage can be realized on your car when you know you engine is serviced regularly, engine diagnostics check out and a tune up is up to date. Things a diagnostic may find is a faulty oxygen sensor and this can rob you of a 40% increase in gas mileage. This is usually the number one item to check for when you mileage decreases substantially and a check engine like comes on. Though in some cases a light may not alert you to this oxygen sensor failure. Regular maintenance and regular oil changes based on your vehicles owners manual can help you maintain good gas mileage. When you replace a dirty oil and oil filter you can see an increase in gas mileage up to 2%. That beats driving around town looking to save 5 cents a gallon! Did you know if you replace a dirty air filter you can be increasing gas mileage up to 10%. If you remove extra weight out of you car this will also help improve fuel economy. If you are sick and tired of filling your gas tank and wasting gas consider downsizing to a more fuel efficient used car. So if a hybrid car is out of the question and your cars maintenance is done regularly what else can you do for the best gas mileage. Your probably already using mileage charts and an expensive exotic electric hybrid is not practice. There are fuel additives and those work by keeping you engine and fuel lines clean so there is no buildup. They can also help keep fuel injectors clean further increasing gas mileage. Most fuel saving devices do not work but some do and it it may be had to chose a good fuel saving device from a scam product. One of the latest devices that is gaining in popularity and getting mention even in the news is hho gas. hho gas can be generated from a hho gas car kit or plans and blended with you current gas or diesel gasoline which may give you the best gas mileage ever. hho gas generator is introduced into the intake manifold and most hho plans or kits are easy to follow for simple construction or installation. Some refer to such a systems as hydrogen on demand. A simple hho fuel cell is can easily fit under the hood of a car and in larger engines more than one cell can further improve gas mileage. This technology is experimental but because it can be constructed or installed at home most basic starter kits can be made for under 100 dollars if you shop around and price parts. hho gas kits are helping people who implement this technology get the best gas mileage of 15-40% on average and in some cases much higher. The other benefits besides improving gas mileage is an increase in power and usually improved emissions.