MPG readout

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SteveB - 28 Sep 2008 23:08 GMT

I have a 2006 2500 with a Cummins. On the overhead readout, how accurate is
the readout for MPG. When you punch it, how long does it take until it gets
to a steady reading that's accurate?

Steve

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FMB - 28 Sep 2008 23:22 GMT

>I have a 2006 2500 with a Cummins. On the overhead readout, how accurate
>is the readout for MPG. When you punch it, how long does it take until it
>gets to a steady reading that's accurate?
>
> Steve

Steve,

For some, the overhead is somewhat accurate, within 0.2 MPG. For the most of
us though, it is only a guideline to compare one tank with another; not that
it is what you are getting, but rather this tank is about the same as last
tank.

If you put in a programmer, you can increase your overhead as much as 10
MPG, but you won't find that anywhere close to reality.

FMB
(North Mexico with an '03 CTD HO)

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Steve Lusardi - 30 Sep 2008 18:25 GMT

Steve,
That is a loaded question that only you can answer. Fill the tank, zero your
odometer and drive the tank empty and check. I caution you to also check the
accuracy of both your odometer and your speedometer. To do that, I use a sat
receiver. If you find that either are off, you can adjust this with a DRBIII
at your dealer. You can change the count of wheel revolutions per mile in
the chassis computer. This will take several iterations, but with patience,
you can get it spot on. If this is now correct, your MPG number will be as
well in the overhead console. This is necessary when you change your wheel
or tire size.
Steve

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