FC depends on alot of factors, City or highway driving, no of stops/idling/jam,condition of car & the most important one...your right foot!
I travel an average 100km perday, 90% is highway cruising, mostly keeping my RPM below 4K (can cruise around 120-140kmh) & no sudden accelerations and VTEC CLOSED (only OPEN when theres some "gelabah" driver...hehe). And theres little idling en route.
A fact about AC is, if you turn off your AC but put the both windows down while cruising above 100km/h, your FC will maintain or worsen. (becoz of wind resistance). A method of reducing wind resistance is just rolling the window down on one side or just opening a bit. Better to just dont put down altogether and use the fan (AC off).