observation on fc

wuming78 SG

usually pump petrol when my tank is 3/4 empty.

today went to pump when it's 1/2, to exploit the current discount frenzy.

to my surprise, my fc for the first half of the tank was a whooping 19+ km/h! all the while i have been doing 16+ to 17.

that seems to go against the logic that the fc of a car becomes better as it travels more, cos as more fuel gets consumed, the car becomes lighter.

anyone has any plausible explanations?

mabbe from now on, i will pump petrol once my tank is half gone instead to make full use of the good fc. Wink

Tomas_Rosicko SG

byebye

ditzy SG

Yes, don't trust electronic readouts too much. Laughing

wuming78 SG

oh btw, i derive the fc myself - based on my total distance travelled b4 i pump (i reset the odometer each time i pump), and the total amt of fuel pumped, and not from those electronic fc readouts.

wbucket SG

Once again I saw the mis-conception about the car being more efficient when the tank is near enough. Haven't seem 1 like this for a while.

Anyway, your car should be the strongest when the tank is full, and should decrease in it responsive-ness as the fuel goes down. Reason could due to the pressure in your fuel tank which assisted the delivery of the fuel into the engine.

Thus the stronger your car feels, the lighter is your foot. And thus the opposite applies. Which explains for small CC cars, FC will drop significantly when you seems to carry more passenger for that tank.

As for the tanks empty part. Don't think a near/over 1 tonne machine make to carry few hundreds of kg is going to be affected much by the 20 to 30 litre of fuel which will amount to 20 odd kg!!!

wuming78 SG

well. i thought the pressure theory makes more sense too. but a friend of mine told me about the weight theory.

and again you are right. when my tank is full, my steering feels like feather!

so that means i wont let my tank go below half full in future. Wink

thanks!

zerocool85 SG

hey bros… so the conclusion is… the fuller the tank, the better the consumption?

ditzy SG

Oh, that explains why my steering feels so sluggish on a near empty tank. Laughing

ditzy SG

If only that theory works on F1 and and WRC. Laughing

wbucket SG

Actually is the lesser the fuel in your tank, the weaker the engine would be, thus the heavier your foot becomes, and the worsen of FC occurs.