@jcboy,
People do fluctuate, though I'm pretty steady f0r whatever reason myself. I've been at or around 141 for something like four years, once I got down to it. Don't really want to go lower, as some avoirdupois is protective for elders.
My recent pie crusts (well, savory torte crusts) are takeoffs on a recipe that uses olive oil. Not your flaky pie crust scene, but I don't care. (If I want flaky, I'll do an old fashioned rolled layered croissant dough, but I don't have the patience). My business partner in my last home town, who cooked somewhat french like I cook somewhat italian, gave up on the butter crusts, after years, and used canola. I suppose I can imagine doing half and half, re the type of fat.