Just the other day, someone said DFCO uses zero fuel, none. It doesn't seem accurate, but I don't know or use it to make it valuable. I would imagine if the engine is on, it is using fuel.
A friend who just got into ecomodding was putting their car in neutral to coast. We discussed why it might be bad, and when we checked with the UG, his vehicle was using >10% more fuel coasting in neutral than drive, but in drive, was still using approximately .50 G/h.
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