Haha...yeah, I would imagine quite a few of us have used diesel. It's dirt cheap and gives you boat loads of traction. It's also a carcinogen and stinks something fierce. Our indoor track has outlawed it for application in the building because so many people complained about the smell. For those that haven't tried it before, get some cheap latex or nitrile gloves for putting it on. The tires tread pattern will actually swell to approximately twice its original size and the foam will expand noticeably as well. Other than the health issues and gnarly stink...pretty amazing stuff.