I have a modified A91 edition with about 21700 miles. Clean title in hand and clean carfax. I am the only owner. The full mod list is below, all OEM parts are included as well. No issues whatsoever on this car, it's been amazing since day 1. I have kept it in a garage its whole life and on...
The way I understand it is Fuel-it just displays e-content on your phone, like a read-only file, where as the MHD fuel analyzer reads/sends info to the DME to allow your ecu to adjust the flex tune based on e-content.