Citizen E610 Instruction Manual page 92

[How to convert fuel between different units of measurement]
You can convert between Liters, US Gallons or Imperial Gallons.
Q : How many Liters are equivalent to 16.8 U.S Gallons ?
A : Align the "  " of U.S. GAL of the outer scale with the digit 16.8, which you want
to convert, of the inner scale.
Result: The converted value (about 63.5) corresponding to the "  " of liter of
the outer scale can be determined.
(1 U.S. GAL = 3.78541 Liters)
195