Is that the correct way to monitor FC!

[Owen_fan]

Wanted to monitor my FC, but not very sure how to do it. Have read those post on how to calculate your car FC, but still not very sure. My mileage during the last top up was 12958km, & I want to top up petrol (1/2 tank, 25.2L) just now at 13325km. So am I right to calculate the my FC as: 13325-12958/25.2 = 14.68km/l?

[Slim]

what i do is reset my trip meter on topup, drive till near empty and then note the amt of fuel pumped in and do the maths. (kinda like what you are doin)

 

only thing is i use averaging, ie average a few tanks topup, as sometimes the pump attendant then to continue pumping even after the auto disengagement of the pump...(and sometimes even overflow a little )

[Sapience]

i average mine over a month, about 4 to 5 topups. have to coz my FC readings vary around 10 to 20%...