That tuner doesn’t know TH has dual Pumps standard.
BAP boosts voltage to pump. Spins pump faster , more fuel volume.
I’ve run them in other cars. Not ideal, but they work
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So when you say close to the limit, should a BAP be considered? Your S1025 package includes both upper and lower pulleys and appears it that the dual Trackhawk fuel pumps are more than sufficient for E85 with your package. Is my interpretation correct?The wiggle room is good question. I will say when both upper and lower pulleys are added with full E85 I would consider it close to the limit.
Hope this helps