Hi, My Ford Fieasta 1.6 S has been running for 4+ years and has clocked 52000 kms, The tyre is now quiet bald, it ran in the original JK tyres that it came with. My question is: 1) Has the shelf life of the tyre been good or bad? 2) It runs on 195/55 15' , should I replace them with the same or upgrade, if I do upgrade what size should I go for? and which brand is good? 3) Does the upgrade lessen the fuel effciency? 4) What is the normal shelf life of tires in Indian driving condition, wherein most of the driving is in city limits with occassional highway trips. thanks, Arul