[Calculation of fuel consumption]
Q : How much fuel is needed for a vehicle to run 5 hours if the fuel consumption rate of
that vehicle is 7 liters per hour?
A : Align 70 of the outer scale with the “” of SPEED INDEX of the inner scale.
Result: 35 liters - 35 corresponds to 5.
[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.