That's the way the engine was designed. The military needed an engine that would burn practically any fuel you put in the tank. If you do a web search you'll lots of interesting information on the Continental multi fuel engines. They didn't produce much power. If you take a good look in one of the photos you'll notice one of the tags on the dash says not to exceed 56 MPH in top gear. Also the speedometer tops out at 60. And they only get about 7 MPG!
