Bro go for 155/70/R12max if u want some wide tyres with comfort.
best i recommend is stock size of mehran,bridgestone sneaker are available in that size and havinggood grip too,
If you get 13s
fuel average woild be comparatively low
pick will be dead
suspension would become stiff
finally will ruine ur suspension
and best u stick to stock size is totally opposite to it.