mazda2 sedan m/t
11.70 km/liter (computation 270.2km /23.10 liters)
start odometer: 120 km
end odometer: 390.2 km

drive from san juan to nasugbu, batangas and back (during holy week with traffic at emilio aguinaldo highway)
3 adults (including driver) and stuff.

is this okay? and is this how you compute highway FC? noob here.