I posted info on the new link.

Having the same problem.

Purchased the vehicle 3 weeks ago.

2015 king ranch
3.5L ecoboost
4WD
All options except rear seat entertainment
89 octane or 93 octane fuel used
No mods
tested both 87 and 91 tunes

I updated the tuner and tried 87 and 91 octane tunes. Both worked well after initial ...

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Jeff

I tried the 87 octane and 91 octane tune on a 2015 3.5 ecoboost. Both tunes initially took and the performance gains were noticeable. Attempted to track mileage on a highway run but in both cases I lost all gas pedal response the next morning. What is Diablosport doing to resolve the issue? ANYONE ...