There's so many variables... Alignment, driving style, maint (tire pressure), where you drive, how much of the time do you use 4wd can all influence which wear quicker.
I am an easy driver (acceleration and braking) with a good alignment and my fronts seem to wear a tiny bit quicker than the rears. It makes sense to me... The fronts carry more weight, do most of the stopping and they steer the vehicle so unless you're a lead foot your fronts probably work harder.
Regular rotation keeps mine very even and nice.
:cheers: