So, let's calculate how many caffeine is there in one can:
2.77mg caffeine / 1oz
12oz / 1can
(2.77mg caffeine / 1oz) * (12oz / 1can) = 33.24mg caffeine per can.
If Lethal dose is 10.0g caffeine = 10,000mg caffeine
(10,000mg caffeine) * (1can / 33.24mg caffeine) = 300.84 cans.
You need approximately 301 cans to drink to die from soda.