use regular unleaded.
What kind of companies use natural gas in California?
unleaded
Any kind of natural stone,......the man made one's are more porous and can't take the high heat (tend to crack). The less porous the better.
Hydrogen Gas.
Premium gas
cheap gas
Use premium gas.
There are number of different kinds of gas you should use. The gas you should use depends on the situation.
Regular unleaded gas.
Hydrogen gas
premium gas
Barbecue grills use propane, a kind of fossil fuels.