Again I don't really care how its pronounced but the justification for jif is flimsy at best.Must be, at least compared to those arguing otherwise and making up false justifications. The creator gets to choose however he wants his acronym to sound, as there are no imaginary rules on acronym pronunciation. Technically, it's G-I-F because its an acronym, or jif for short.
You will all learn in time. UEONO.
Do you pronounce GABA as JABA?? Do you pronounce GAD as JAD? These are commonly used acrnoyms in medicine and no one pronounces these with a J.