Two motors at 25% motor speed bring the AEV the farthest distance in the least amount of time with the smallest energy cost when compared to one motor at 50% and 25%. Two motors seems superior to one in terms of efficiency.
We found that running the motors at 25% capacity used the least amount of energy overall. 30% capacity used almost the same power, but was a little higher. 20% capacity used much more energy than both 25% and 30% capacity.
Running the motors at 30% allowed the AEV to get the furthest the fastest. Seeing as this uses essentially the same amount of energy as running the AEV at 25%, it is more efficient to run the motors at 30% capacity. If the AEV were to run at 30% and 25% going the same distance, the 30% capacity run would use significantly less energy.
35% motor speed was the most energy efficient speed for towing the caboose, followed closely by 40%. Further tests may have shown 40% to be more efficient, but 35% was slightly better in this case. 45% and 50% speeds proved to be very inefficient, using much more energy than the other two speeds and often not gaining much more distance or time to make up for it.