I wonder what the side-by-side-by-side comparison of a gallon of gas vs. the equivalent energy in batteries vs. the equivalent energy in hay would look like...
A lot of hay, but slow and steady won the American continent.
OTOH, foraging horses, mules, donkeys and oxen fueled up along the way.
This is one of the reasons the South held out as long as it did during the CW. Confederate horses never ran out of fuel.