ArtHummer
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The truck noted above has been used extensively and continuously gets 600 miles to a tank, it is fitted with 55 EGG tanks (Equivalent Gas Gallon).
This is not an improvement in gas millage... On average we get 270 miles out of 20 gallons on gasoline. out of 55 gallons you should squeeze about 750 miles. It's just a numbers game.
This system recently got popular in Russia and I did a little research on it. With CNG you will not gain anything. You will use more EGGs per mile and you will experience lose in power. The only good reason is to switch on CNG is the cost of natural gas vs gasoline. In Russia the natural gas is more then two times chipper then gasoline. Also, the tank is under very high pressure and that why it should not be mounted underneath. And, If the rapture of the tank will happen (due to hitting a tank on the rock or in the accident), the tank will turn in to a bomb and will explode. If the pressure regulator valve fails and tank will overfill it will explode... It make sense to have CNG on the bus and have the tank on the roof.
Also, in Russia they use little 10 gallons tanks and place it inside the car where spare tire is located. And with 10 gallon tank they have to fill up every day.
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