I've been grabbing the charts from here:
https://ebike-mtb.com/en/emtb-motor-comparison/ that use power draw vs. output. Then I feed the charts in to ChatGPT to get an average efficiency. It's worth noting that the Mahle derated when 250w rider input was put in, so even though it shows the highest efficiency, it was tested with only 200w input so is maybe an outlier. It appears that they are going from most efficient to least efficient. These efficiency's matter because if you need to add a bash guard and more battery size to equal meters climbed and protection, that's a more true measure...