You haven't "flown". Jesus, where is the common sense. It's embarrassing that you would even consider logging taxi time. I used to do compass swings at various times in various aircraft in the past. Bugger, I didn't log them, could have got me at least a dozen hours or so. Really, do you need to log that 0.1? I'd be embarrassed to put that in my log book. In my airline days, had, lots of return to the gate, and rejected take-offs, but I'm going on my memory on that as I sure as **** didn't log em.