Reduce 90% outgoing traffic

I am changing my VPS to a instance on Amazon EC2. The thing is: I was choosing my AMI but i saw a custom AMI that promises to reduce outgoing traffic by 90% but I lost the link. It seems to be scam?

Someone here know about this? By the way I would like to ask some hints to reduce traffic.

I really need change and amazon charges for outgoing traffic (even if you are a new customer with free tier elegible, just 15GB free outgoing traffic...)

Now my VPS:

1 core 1GHZ 1.300MB RAM 60GB Disk Space 1TB outgoing traffic

And I pay $58.00, nothing cheap.