Fuel consumption calibration?
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Mountain Pass
Joined: Sep 2005
Posts: 130
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From: Plainville, MA
Fuel consumption calibration?
My new 2011 f350 has the fuel used displayed in the dashboard under trip a and b screens, which is clearly used to calculate mpg in the other display. The fuel used is close, but reads a bit low (18.6 gallons shown but it takes 19.5 gallons to fill, for example) creating an "optimistic" avg mpg reading. Is there any way to adjust or otherwise calibrate the consumption measurement?
Posting Guru
Joined: Dec 2010
Posts: 1,318
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From: Sterling Heights, MI
Try to fill up the tank the same way every time. If you top off until you can't put any more in, then do it that way all the time to get more accurate measurement. The computer is not perfect but is pretty close. The only way to get a accurate reading is to install a flow meter on the fuel line.
I think the computer does a good job to give you a estimate on how you are driving. Nothing beats the good ol fashion way of pencil and paper and some simple math to get the real MPG's.
I think the computer does a good job to give you a estimate on how you are driving. Nothing beats the good ol fashion way of pencil and paper and some simple math to get the real MPG's.
Senior User
Joined: Sep 2010
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typically with the fuel injectors.
the computer knows how much fuel goes in on each injection cycle, then multiplies it out by rpms and divides by distance traveled to get instant mpg.
it has nothing to do with how much is in the tank.
to get the average mpg it averages all the instantaneous mileages.
if you only had a flow meter in the supply line to the fuel injectors then you would probably never get above 2 mpg considering the fuel return to the tank would not be taken into account
the computer knows how much fuel goes in on each injection cycle, then multiplies it out by rpms and divides by distance traveled to get instant mpg.
it has nothing to do with how much is in the tank.
to get the average mpg it averages all the instantaneous mileages.
if you only had a flow meter in the supply line to the fuel injectors then you would probably never get above 2 mpg considering the fuel return to the tank would not be taken into account
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