Citizen E610 Instruction Manual page 98

[Calculation of drive time]
Q : How many hours can a vehicle whose fuel consumption rate is 8 liters/hour run
using 40 liters of fuel ?
A : Align 80 of the outer scale with the SPEED INDEX "  " of the inner scale.
Result: 5 Hours - 5:00 on the outer scale corresponds to 40 of the inner scale.
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