Xon 87 is a gas giant in the Galaxy.
It's main exports are Grade-A, all natural smog (packed in aerosol cans), and lightly sweetened organic petroleum jellies. Fossil fuels are abundant there, and used to power nearly all of Xon’s land and air transports.
Roger once visited Xon, and experience of riding in an open ground car behind of Xon’s diesel fueled buses. After an hour of inhaling the fragrant fumes that the buses exude, Roger’s perceptions seemed to brighten, heighten, and he became some-what euphoric. 
- ↑ Space Quest Companion, Second Edition, 219