I may be (probably am) wrong but isn't there an issue with power/weight ratio on the EHI-01 which means it can't make use of its designed ability to turn an engine off for more economical cruising other than in very specific circumstances?
You can normally get a better range with the two engine cruise.
There are concerns with wanting the third engine should you require coming to a hover, and you have to be aware of height loss should you lose one of the two operating engines. Because of those considerations, it is only wise to consider two engine cruise when you're planning long distance cruises.
Matthew.