gasoline price is getting expensive! what is the very best GAS SAVING DEVICE 100% proven effective?

a well tuned engine, a light foot, and high pressure in your tires.

walking

100% proven effective every time… Turn the ignition key to the left, and remove it from the switch. Now walk to the corner and take the bus or other available mass transit.

It’s called a bicycle.

An efficient car and what they said. Don’t believe any gimmicks or products claiming to increase mileage.

The Horse ………………..worked for thousands of years, the car is only 100 and a bit years old.

I hear u! Listen, if what u r trying to do is to start saving little by little on gas, start with your car! Yeah, that gas drinking machine that we have created to finidh ourselves off! Anyhow, consider converting your car into BIODIESEL first and then even your heating system in your house to function with cooking oil. And guess what: IT does not even have to be fresh, new off the bottle, it can even be waste vegetable oil that your local chinese restaurant has used and is looking for a cheap way to get rid of it! That means you dont even have to spend a penny after you setup the car and the converter. Anyway, just check out the links below and make something out of it. Believe me, I have done it years ago and it works like a baby… and a money-saving machine now
http://www.ravenfamily.org/andyg/vegoil.htm
http://plantdrive.com/learnmore/usedcookingoil/usedcookingoil.html

It is proven that a lighter accelerator foot is the best way to save gas. Drive like a human being, not some kid trying to impress people with speed. Any car, SUV you can maximize fuel economy by being a responsible driver, accelerate gradually and not bury your foot in the throttle. Also, a clean air filter, and fuel intake system will also boost your mpg.

a moped.