Annex14:
"The max. range of a Saratoga apparently is more than double the distance of all flights covered by the accident aircraft known so far on that day."
Correct. But this Saratoga had neither been refueled in Dortmund prior to the first leg to Arnsberg, nor has it been anywhere else on the round-trip. Yet we have no idea on how much useable fuel the pilotīs calculations were based. Certainly a lot less than 100 gal.