In a spirit of scientific enquiry , the last 3 days I have had a v3.0 Huel Bar about half an hour before my early morning run (8 miles).
I could feel it in my stomach, but it didn’t cause any discomfort or problems. Otherwise felt at least as good if not better than normal (normally eat nothing if the run is early morning and less than about 10 miles) and my times were pretty good. Though obviously impossible to discount the psychological effect.
If it were a longer run, I would have given myself more time to digest before starting off. On a longer run, a mixture of slow-release and fast-release carbs + protein seems to suit. A banana + protein bar or protein porridge has been a staple, but I may try Huel Bars now v3.0 has arrived (v3.0 has dropped the chicory root fibre and no longer upsets me).
Though… If I’m doing a long run in the morning and something upsets me, I’ve found it’s as likely to be what I ate the night before as on the morning.
Your mileage (weak pun intended) may vary.
Can’t offer any comment on liquid Huel.