Grainger,
You’re quite right; the report doesn't state that they ran out of fuel, simply because the investigators don’t know, only the two pilots can confirm or deny that, and they have taken the fifth. Until they come up with the answers the speculation will continue; pilots love to speculate, it's in their nature. What needs to happen to restore the credibility of these two pilots amongst their peers is for them to co-operate fully with the authorities on the investigation into this particular incident.
I don't doubt for a moment that an extended tank can be fitted to a Robinson, but why won't the crew divulge the fuel state? Their attitude gives the impression that they have something to hide.
There are more reasons for an investigation other than a which-hunt, or apportionment of blame. Lessons can be learned and possible lives saved in the future.
The achievements that Robinsons have made in the past, whilst highly commendable, are of no relevance whatever to this incident.
Sorry if this is a bit disjointed but am in a hurry for a late shift.
Fly safely,
Choppeman.