Here is the perspective about horses. A small steam engine adapted into a vehicle is still enough power to move it along at 15 miles an hour in low gear. 15 miles an hour is still better than only 20 miles a day for a horse. :)
Here is a vehicle with only a 6.5 horsepower engine and it gets a hundred miles to the gallon. But it doesn’t go fast of course, but it goes...
A small wood fired steam engine could be adapted to do the same thing in any vehicle. I know your capabilities and knowledge so it would be no problem for those like us.
https://www.youtube.com/watch?v=WSc9CVyje5Y
I will check out the links, thank you!