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This found in the book THE SCENCE OF PREFLIGHT AERONAUTICS Copyright MacMillan Company, 1943. p. 663.
Dead Reckoning (really "deduced reckoning," many years ago abbreviated "ded. reckoning" and hence gradually evolved into "dead reckoning") is that method of finding a planes course...
from page 377
The octane rating of fuels for several purposes is shown in the following table:
Military aircraft
High output engine ... 100
Primary trainer ... 65 and 73
Commercial Automotive
Best grade ... 74-82
Standard grade ... 65-74
Cheap grade ... 55-64
Dead Reckoning (really "deduced reckoning," many years ago abbreviated "ded. reckoning" and hence gradually evolved into "dead reckoning") is that method of finding a planes course...
from page 377
The octane rating of fuels for several purposes is shown in the following table:
Military aircraft
High output engine ... 100
Primary trainer ... 65 and 73
Commercial Automotive
Best grade ... 74-82
Standard grade ... 65-74
Cheap grade ... 55-64