Instead of Tighar
try
https://earhartsearchpng.com/2016/01...earch-project/
and read kelley Johnson LAC report 487 for a few facts as to real range
https://tighar.org/Projects/Earhart/.../Report487.pdf
the only real facts tighar found
Analysis Range
Prepared byPrepared by C.L.. Johnson
DateDate JuneJune 4, 1936
LOCKHEED AIRCRAFT CORP.
ModelModel 10E
pay close attention to page 9 and effects of staying within 140 to 150 TAS for 16,500 AUW- but earhart started with about 15000 plus or minus AUW . . .
Report NoReport No 487487