revision

Just installed new return style fuel system, waiting on a new revision from Lund for e85, currently tuned by Lund on 93. Is it safe to drive and more so hit boost on a return style fuel system running 93 octane in the mean time while waiting on a tune (they said up to 2 weeks) 2019 GT ESS...

I've been using 93 pump gas since I got the tune and initially AFR at idle was 13.5-13.8, and 11.4 or so at WOT. Now it is at 12.7 at idle and 10.4 at WOT. Still using 93 oct pump gas and alcohol % is showing 32%. Anybody else get this? What'd you do? Edit: Solution on page 2.