Joined
·
65 Posts
So it seems that everyone accepts the DIC fuel mileage calculator to be inaccurate and trusts the hand calculation method. My question is why?
There are known deficiencies with the flow rate measurements on your local gas pump. Temperature plays a role in fluid density which determines how much of that 'gallon' you actually get (you should try to fill up during the coolest part of the day). Also, the faster you pump, the more vapor is created within the fuel. The vapor gives false readings on the flow meter (you should fuel slowly to maximize your 'gallon'). Excessive fuel vapor and foam can also cause the pump to shut off early.
So basically, the system isn't perfect.
Now this is where my real question comes in: What is the precision of the fuel metering device on our trucks. These engines have precision fuel delivery systems, which would make me think that they can monitor fuel usage to extreme accuracy. This would theoretically be able to give a more accurate average and instantaneous fuel mileage report. Is this not the case? Or does GM purposely inflate the numbers (in the ecm) to make people think they are getting better mileage than they are?
Sorry if this has been answered before, but I couldn't find it anywhere.
There are known deficiencies with the flow rate measurements on your local gas pump. Temperature plays a role in fluid density which determines how much of that 'gallon' you actually get (you should try to fill up during the coolest part of the day). Also, the faster you pump, the more vapor is created within the fuel. The vapor gives false readings on the flow meter (you should fuel slowly to maximize your 'gallon'). Excessive fuel vapor and foam can also cause the pump to shut off early.
So basically, the system isn't perfect.
Now this is where my real question comes in: What is the precision of the fuel metering device on our trucks. These engines have precision fuel delivery systems, which would make me think that they can monitor fuel usage to extreme accuracy. This would theoretically be able to give a more accurate average and instantaneous fuel mileage report. Is this not the case? Or does GM purposely inflate the numbers (in the ecm) to make people think they are getting better mileage than they are?
Sorry if this has been answered before, but I couldn't find it anywhere.