I just recommend getting an oil house if you're going to do oil, and would like to use a tempest device. I mean its pretty clear in my opinion that there are fuel vehicles, both air and ground. If you can put 2 and 2 together you can figure out they can only be used for one mine-able material. Plus if you are not willing to take the step towards buying a house for whichever specific run you're doing, it is not worth it, unless you are just starting out. Just my opinion though.