According to Wikipedia, compressed natural gas (CNG) can be used to power vehicles. It is predominantly made up with methane, but could have as much as 20 mole percent propane in it. Assume it does have the 20 mole percent of the heavier gas. This gas is often stored at 220 bar. Assuming your trunk of your car were filled with four gas cylinders that are four feet long and have a diameter of 10 inches, what are the total moles of CNG you could hold in your trunk in these tanks?