The accord went away. The son who did not want it decided he did

. But that's good because he was driving a SUV that got 12MPG so I'm glad he has it if he'll park the tank.
Do you have a link to the DIY? I don't think that it would run much leaner the 15.1 but I think with additives and heated fuel you would see a much better increase in FE with it. I don't think you would hurt anything because if you WTO it goes to open loop and if you try to get it too lean it will go to open loop.
Inspection would be interesting I guess. I did mine last month and the guy pops the hood and is like WTF and then starts quizzing me about the VG heated fuel belly pan etc.