Fuel makes some nice wheels that are weight rated well enough. Steel wheels are really to heavy for good economy but they have their uses in extreme environments. Just not a lot available at decent prices in the right sizes. Need to go to 18" or 20" for a better selection of tires and thta weight increase is a killer with steel.
So did I with the 19.5" Rims.
Just for comparsion, the OEM alloy with 315/70-17 weighs each 92 lbs.
The steel One with 265/70-19.5 weighs each 163 lbs.
So in total the vehicles weight increased around 280 lbs just with the 4 wheels, I didn't bought a spare.
That's real heavy.
I don't see any issue and really doubt you could measure a fuel mileage increase with 72#.