[Diesel_Dave]

Let me start by saying that I'm pretty bad when it comes to electronics.

I've started to do more EOC now, and the issue is that I "lose" some of mileage (on the odometer) during the period between when I turn the ignition off, and when I turn it back on after the engine stops. I estimate this is up to about ~5% of my miles when I do lots of EOC. I believe (but am not entirely certain) that the odometer is controlled by the body computer--not the ECM.

Why can't I just put a kill switch in the ECM key switch wire? Wouldn't this shut the engine down by shutting down the engine down "normally", but leave the body computer (and thus odometer) on?

I've done some research and this seems like a pretty simple and easy solution, however, I can't find anyone who's done it and I'm not sure why.