According to both websites the ATW Alloys with tyre weighs 65kgs and rated at 3000kgs ATW steel and tyre weigh 76kgs and rated at 3000kg, Kym Boltons rim and tyre combo weighs 60kgs and rated at 1950kgs
I gained a full mpg going to a heavier wheel/tire combo on my dodge. Stock alloys with nitto 34’s MT’s weighed about 94 lbs iirc. Toyo m608z 34” with steel 19.5” rims come in at 150 lbs. yet I gained 1 mpg. My $.02