Regardless of tire, if using quality tires, I've found no front-to-rear difference based upon tire selection, but I have found that I can totally change wear through riding habits. My previous sport tourer would shred front tires two to one over rear tires. I could peel scrub a visible profile into a front in one long day. That bike had fully linked, servo assisted braking. It was wonderful. All upside and no downside. This led me to develop the habit, since the system was unflappable, of frequently braking in turns. I could go in as hot as I wanted, because one fingertip on the lever would tame the beast we call speed with no ill effects on handling, trajectory, or traction (tele-lever was, admittedly, part of what made this possible). As a result, I ended up braking at high angles rather regularly. My current steed is not so fancily equipped, and isn't as happy to compensate for bad habits. As a result, I rarely go into a curve hot, usually completing my braking prior to entry, accelerating through the turn where appropriate. This dramatically changes the demands (I think) on the stickiest parts of the front tire, and as a result, I now wear front and rear tires fairly evenly. Maybe not same-same, but no longer two to one. Using engine modulation rather than braking in turns also serves to wear the sides of the rear tire a bit more, which is a bonus, because I do a lot of commuting and interstate travel between pleasure trips, and would otherwise have more shoulder left than center on the rear.