While we were speaking with the owner of this Jeep, Kevin Denny, we made a crack about the big propane sticker on the side…like why would a high-horse, high-compression Jeep be advertising propane. We just assumed that all of these Jeeps were running race gas. Nope. This 406-powered ’75-ish CJ-5 has two propane tanks under the tonneau cover behind the driver and passenger seats. It turns out that many of the Jeeps racing on the ice are propane-powered.