Originally Posted by
kzap
Is it worth it to combine the JR Pass with a 72 hour subway card if I am in Tokyo for 4 days?
I suppose you could. But the Suica card is much more useful in and around Tokyo and also valid in Kyoto - and you can turn it in for a refund of remaining funds, less a small service fee, at the end of your trip. Suica will work anywhere the subway card will but the reverse is not true.