I am beginning to learn about EFI and all the acronyms are confusing to the uneducated on this subject. I know what TFI does, sort of, but can someone please tell me what TFI stands for? Still learning my way around the site. Checked the search and can find lots of data on TFI but none I have seen say what it stands for. Just curious. Part of my on going education. Trying to get up to speed before summer. Thanks.