one of the most debated topic in almost all the automobile forums.
my take drive normally making sure loading up the engine in a proper way
no abrupt acceleration and braking, rather loading up in all gears, warm up very imp!!
Increasing speed gradually, from say 50 to 60 settel then to 70 kinds
ofcource initial few hundred kms dont run in one go and make sure to take break with idle down if you have to
i dont believe in mothering the car to keep under 2k rpm and all, normal cautious driving with a watch on engine temp, avoid rev limiter rpms.
this i have followed in zen, iKON and the humble CT 100 took the mototune way of extreme runnin in.. end result not much difference due to either and all stable healthy engine, zen has done more than 1.25 lakh km by now and is with my uncle
at the end of the day its ur money, dont go with extreme ways if you cant afford any eventuality but that doesnt mean you have to baby foot either.
expecting swift vdi and planning to follow what i did with previous cars, just healthy normal (loading in gears) runin, will post the results
purely my opinion and always do listen to what manufacturer says, coz they are the ones who offer warranty at the end of the day.