I find that I generally pronounce 3 letter acronyms letter by letter but I pronounce four letter (or more) acronyms like words if I can, and only fall back to l

I find that I generally pronounce 3 letter acronyms letter by letter but I pronounce four letter (or more) acronyms like words if I can, and only fall back to letter-by-letter if there's not an obvious word-like pronunciation. There are certainly exceptions ("SQL" being a notable one).