Remember, DFCO still gives you a charging system as well as engine vacuum. You get both of those as long as the engine is spinning, whether it is using fuel or not using fuel.
Thanks for the complimentary PM, it's always a pleasure to help any fellow hypermiler to beat OPEC out of some money, especially the kind you can keep in your pocket.
You might try driving with no boost to the brakes or power steering, just to get a feel for what it is like. While the inputs will be significantly heavier than when you have the engine running they should not be that bad.
regards
Mech
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