Well they are 71 lbs in the 37" diameter
My toyos are 96lbs at 37" diameter!
25lbs more has to be a diesel guzzling difference
I am guessing that you are not comparing precisely the same tire (ply, etc...) tire for tire?
Toyo MTs are a stout tire with a bunch of material to them. The 33s I had on my Ram were 89lbs a piece IIRC.
They're always considerably heavier than the same spec tire of a different brand.
