First, it's reversible (the mod) so a great opportunity to test both configurations and see which is better for mileage and it could even be vehicle specific and certainly location specific.
In driving scenarios where you would never use DFCO, obviously DFCO could be a disadvantage. In scenarios where you can get nailed by tripped lights, DFCO might win out and with a modern, fairly expensive car, if I could beat my DFCO scenario mileage without transmission stress then it would obviously be the better choice. I try to avoid DFCO as much as I can, but there is always the car that trips the light at the precisely WRONG time and that forces me to stop.
38.64 MPG is impressive especially when you consider the best 06 Imprezza is 27 highway. That fact alone points to paying attention to the OPs position, since the proof is there. Even if a technique that eliminated DFCO such as this experiment offered little or no improvement, the lower overall transmission stress justifies the means of accomplishing that alone.
Interesting thread
regards
mech
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