Carlos from Spain:

Same hard tires go into all cars? Have you heard about the relation about tire temp and grip? And how each car achieved a different temp, and each driver too depending on his driving style? FYI Hamilton's driving style wears tires quicker but heats them up more and they achieve higher temp than teamate's Button during the weekends. That is good in GP's were they struggke with temp like yestetfay but a handicap in GP's that tires suffer from excesive wear. 

 

Carlos, that's a SETUP problem. :) Loose car vs tight car, tire pressure, car balance, downforce in the front vs the rear, etc.