Paul, in looking at your flushing advise, might I suggest something to consider...
5) Drive until near E then fill again. The idea is to get the injectors and chambers clean, then make sure all the cleaner is burned up and diluted. Plus some of this and the dirt/FI cleaner will end up in the oil. (Don't want this stuff in your new oil) Now time to get rid of the old oil.
This is a bad idea IMO as it will cause more problems for people than you can imagine. By running a tank dry such as suggested you will pull the basic bad sediment that is in the lower part of the tank and cause injector fouling. In any injector system it is not advisable to ever really run your vehicle down past the 1/4 mark on your tank due to this. Any water deposits, dirt, or any other sediment due to long years of use will be on the bottom and will injest into the pump to the injectors if drained too low. I myself have experienced this first hand and it took a bit to get it cleared.
As for oil drains, by doing this oil drain proceedure, it obviously won't hurt but it will not clean an engine as well as using a neutralizer to breakdown the acid build up on the engine due to long term use. I also find that if your oil is staying exceptionally clean then it isn't doing it's job as it should suspend by products of the engines gases and cause the oil to darken some. A clean oil shows it may not be carrying off and suspending this. All engines produce some by products and thus all oils should be demonstrating this to some degree. Those that don't turn dark, I question its ability to maintain a clean engine.
just something to think about.