My example is stemming from a 1410 compared to a 1415. So both 1y

Here's my 1415 on 3s, running 49mph, on 3s in my Pede 4x4



Here's my 1410 running 49mph on 3s.



Here's my 1415 on 2s running 30mph



Here's my 1410 running 33mph on 2s



The max amps, and the average amps are both higher, with the bigger motor. Even though the speed is the same or lower. Now, it's all pretty close, so I would assume the 2650 and 2200 would be even closer. But I logged probably 10-15 runs with each setup, and the 2400 always drew more amps, and averaged more.

You can't judge efficiency off temps when you are dealing with 2 different sized motors, as the bigger one will always run cooler, given the same load and efficiency. IOW just because the bigger motor is cooler, does not tell you that it is more efficient.