Early antique tractors frequently featured dual-fuel systems engineered to minimize operational expenses. Operators started the engine using clean gasoline to warm up the manifold, then switched a fuel valve over to cheaper kerosene or tractor distillate. Dual fuel tanks and heated carburetors allowed cash-strapped farmers to run long workdays on remarkably low fuel budgets. https://www.aniarticles.com/80023-top-5-electric-and-hybrid-tractors-worth-watching-this-year