Interesting why? You perhaps enjoy catching someone out or proving wrong? I recall 720 60 creating a simillar file size to 1080 30. Havent shot either for a while and several firmwares back so things may have changed.The P2V camera maxes out at ~11 mbps regardless of resolution.
Please provide proof that P2V 720/60p video files will be larger than 1080/30p video files.
This should be interesting...