anadlas

So i had grand plans for the JKU but after the addition of my new future jeeper to the family i realized that they were not financially viable at this time so i've scaled back the plans. I'm looking at adding 275 70 18's all around and a teraflex 1.5" leveling kit. Now i currently have 3.21 gears because of an oversight when purchasing my jeep. My question really is will i be able to run this setup without any major drawbacks? Should i look into an AEV Procal to try to gain some back? I don't really want to re-gear right now cause i'm not sure which tire size i want to go with down the road. Just curious if anyone is running a similar setup and how they feel about power losses or MPGs or anything like that.