The compound and the "pre-load" could be factors, shoot my wife's 07' Camry has a TSB for the rear pads wearing out too fast. Your always going to have more than 50% (usually like 85/15 or so but sometimes more rear bias) because all the weight is on the front end with the engine etc. Now on a rear/mid engine car, the bias is probably different but you want most of the stopping power up front where all the weight it. And sorry, didn't see the "as much" for some reason lol