Well, my second fillup (at the same Gulf station/pump as last time). My distance to empty showed 5 miles on the MFA. The pump would shut off instantly if I tried to lock it into even the weakest detent so I manually held it and it took 16.689 gallons. That includes several bursts at the end, waiting for foaming to settle down, until I could see non-foamy fuel in the filler neck. I logged some parameters in VCDS at the same time, fuel level sensor (Ohms), fuel level (liters) and fuel gauge reading (degrees):
Actual MPG was only 28 (all city, with four cold starts per day, only 4 mile commute each way with trip home and back at lunchtime). The MFA said 30.1 but I think it may not have gotten completely topped up last time.