I rarely use these abbreviations, so when I do, I have to look them up for clarity. Many people often use i.e. not realizing there is a difference between the two.
Of course when it is time to use these abbreviations in your writing, it is difficult to remember which one is which. Mignon Fogarty offers this excellent memory trick in her Grammar Girl podcast entitled “I.e. Versus E.g.” In other words starts with an i, so does i.e. Example starts with an e as does e.g. You can use this memory trick to help you remember which abbreviation to use. Also, remember these abbreviations require a period after each letter and are followed by a comma. Fogarty, Mignon. I.e. Versus E.g.” Grammar Girl’s Quick and Dirty Tips for Better Writing, Podcast-audio. October 20, 2016