It's about time for new tires for my 2017 Pro4x 5.0 and I'm looking at the BF Goodrich KO2's in stock size (275 65 18). I have the original OEM tires right now. Has anybody installed BFG's and seen a drop in their MPG? I'm not off road much, but is nice to have better traction when needed and I like they way they look. Just wondering if I should be prepared for a drop in mpg? I had the KO2's before on my land cruiser and loved them.