Yesterday I had a brief loss of engine power. I'm 26 hours into my Phase I testing and was doing fuel flow/airspeed tests at various altitudes while playing around with the leaning function on my new Dynon SkyView. The attached 'full flight log' file shows the entire 1.7 hour flight. I was on the right tank for the first 30 minutes, then switched to the left tank for the next hour. You can see this in the third graph down from the top, which shows the 'Fuel R' level dropping steadily then leveling off when I switch tanks. 

I have EI fuel probes with output a frequency proportional to fuel level. They feed Princeton frequency-to-voltage converters which in turn talk to the EFIS. The f-to-v converters have a considerable amount of damping. When combined with the filtering in the EFIS' fuel readout, we determined that it takes nearly 2 minutes for a fuel level change to register on the display. As we'll see, that's good for long flights, not so good when maneuvering.