I had a similar result, with fuel-cut at the same time on the downhill.
I would have loved to see how high I could go, but soon after this photo, I ran out of hill!

Fuel cut is indicated by the 0.0 horsepower reading, even though I was going 50-55 miles per hour. 12.0 amps of regen was still allowed, even though SOC was high. SGI was estimateing 83.3 MPG, which was wrong since no fuel at was was being used at the time. Water temp cooled to the 140's quickly. -John