Alloy Wheel Weight

I have a 2013 DCSB TRD Sport 4X4 and am running Michelin M/S 2 265x75x17 tires. I understand that the Sport alloy wheels weight 28 lbs each. I am considering going to Stealth 6 wheels which weight 23 lbs each. My question is would I notice any appreciable difference? When I went with the larger tire, it seemed that the truck was a little sluggish compared to the stock size.

 

I would assume you might gain few mpg reducing weights. I'm sure those guys with those wheels on will chime in. I'd like to know too cuz since I put my BFG AT KOs on my 2013 v6 trd sport dcsb 4x4, it feels real sluggish. I have been thinking about going back to stock due to the sluggishness .