When one have put alot of extra stuff like bull bar, back bumper bigger tires so one would NOT worry about mileage. Ofcoarse these heavy stuff affected the mileage. But okay with that. Its mostly running in local, so getting 7-8kmpl, still this mileage vary , sometimes even 5km.
In my EX vigo UK, we put mud claws, but soon after a drive we removed. Reason : hitting the inner sides, then we tried geolanders, actually geolandars are quite while driving on motorways or locals, i found that. NOT much differnece i feel.
Plus, our both vehicles, this one and the EX vigo, were fully loaded. But we didnt feel much deiiderence in handling or grip or making sound.
I dont know your use, we use our vehicles for extreme offroad, local drive or motorways.
I know there ATS are not for extreme offroad, as we havent tested yet as well.
Iwill suggest you to go for yoko, just even try.