I polled for KE, as the only reason I would need to know the speed is to figure the KE.....AS said before momentum is what I look for (which kinda goes hand in hand with all of them). I tend to adjust the weight of my shafts to get the most everything I can out of that bow.I have always went with a little heavier arrow (weight tubes) versus the light weight arrows, yeah you loose a little speed but you dont have arrows penetrating the sheild of a hog barelyan inch...(One of my buddies done this back in the day with some light easton acc's that he normally used on the 3-D course). I have light arrows but they don't get used except on the 3-D range and I use them there for speed (flatter trajectory), less error....I don't use anything in a hunting situation less than 400gr....