# What is the density of compressed natural gas (CNG) used in vehicles? [closed]

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.

## closed as off-topic by Todd Minehardt, airhuff, andselisk♦, Mithoron, Jon CusterApr 14 at 0:15

This question appears to be off-topic. The users who voted to close gave this specific reason:

If this question can be reworded to fit the rules in the help center, please edit the question.

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.

• 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. – ADH Feb 12 '15 at 19:22