I was shooting 275fps with my PSE Mohave. I put on limbsavers and it changed my tune and slowed down the bow about 3-5fps. I do have a chrony. I am not worried about 5fps. But was surprised when paper tuning, I then had a right up down rip. I lived it and adjusted my bow to a heavier poundage and got rid of the rip. I also took them off and verified. It was the limbsavers.

I have acutally seen some gain fps. I mean think about it, your putting weight on your limbs. On straight limb bows with little flex, I doubt they would havemuch difference but a bow with low brace height and small riser, I can see them changing things.They won't have the same flex as before.