Dash readout V's actual

[BDC]

Scangauge only has tools at its disposal which are already present on the vehicle. There are no fuel flow meters on cars, and all MPG meters only use the pulse width from the car's ECU to the fuel injectors as a measure of fuel flow. So the scangauge and all other MPG meters (in production vehicles) are limited by the accuracy of this signal.

[Draigflag]

Originally Posted by BDC

Scangauge only has tools at its disposal which are already present on the vehicle. There are no fuel flow meters on cars, and all MPG meters only use the pulse width from the car's ECU to the fuel injectors as a measure of fuel flow. So the scangauge and all other MPG meters (in production vehicles) are limited by the accuracy of this signal.

Some people here are reporting better/more accurate readings from the Scangauge than the cars computer, otherwise, what's the point buying one just to get the same info the cars computer gives you?

[BDC]

Originally Posted by Draigflag

Some people here are reporting better/more accurate readings from the Scangauge than the cars computer, otherwise, what's the point buying one just to get the same info the cars computer gives you?

Not all cars allow you to see that data. And the scangauge does indeed have "calibration parameters" which are nothing more than scaling coefficients, but some folks use them to make their scangauge line up with their empirical data.

[litesong]

Originally Posted by BDC

There are no fuel flow meters on cars, and all MPG meters only use the pulse width from the car's ECU to the fuel injectors as a measure of fuel flow.

Could your information be a reason that burning E0 seems give a slightly more accurate reading of mpg than the use of E10 gives, since E0 averages 8%, 8%, 7% & 5% better mpg over decades, than E10 in my 4 cars?

[BDC]

Originally Posted by litesong

Could your information be a reason that burning E0 seems give a slightly more accurate reading of mpg than the use of E10 gives, since E0 averages 8%, 8%, 7% & 5% better mpg over decades, than E10 in my 4 cars?

No, ethanol content wouldn't have anything to do with the accuracy of the fuel flow calculation.