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I would like to know the density of the compressed natural gas used for natural gas vehicles in order to complete the formula in this Mathematics Stack Exchange post.

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The density of CNG at the pressure of 200 bars (which is optimized for use in vehicles) is 435 $\frac{kg}{m^3}$. However, it's (not usually) 175 $\frac{kg}{m^3}$ in some vehicles in some countries. Note that it differs according to your home country.
Source 1 and source 2.

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  • $\begingroup$ If I plug that number (175) into the formula in the other post. I get 74,399.95 miles per gallon. That does not make sense with the data I have been given. This does not mean that your answer is wrong though. $\endgroup$ – ADH Feb 12 '15 at 19:22

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