Hittite has a verbal prefix u- that indicates motion away from something. Kloekhorst connects it to Latin au-fugiō, "to flee from", saying they both come from PIE *h₂-u-.
However, I'd always thought au- in Latin was just the form of ab- before f (cf au-ferō).
Is Kloekhorst right (or, rather, are his views commonly accepted) about this? And how much evidence is there either way?