Use e.g. when you mean for example: I like junk food—e.g., Doritos and Pringles. (How to remember: For eg-zample.) Use i.e. when you mean in other words: He ate Doritos and Pringles—i.e., junk food. (How to remember: in other words.)
David Pogue
Use e.g. when you mean for example: I like junk food—e.g., Doritos and Pringles. (How to remember: For eg-zample.) Use i.e. when you mean in other words: He ate Doritos and Pringles—i.e., junk food. (How to remember: in other words.)