DTE Questions + Odometer Question

[bartsau]

Ok so I have a question with regards to the odometer on my wagon. Now since I have fitted 3.9 diff gears in my wagon I have noticed that despite revving at approx 2700rpm at 110km/hr and at 100km/hr sits on about 2400rpm, that it is actually returning very good fuel economy.

Around town and coping a lot of use from the loud pedal it returns between 12-15l/100km which the way it is driven is rather good.

I did though just go up to Kyabram for a night to see my sister and from Frankston to there and back + a trip to Echuca it returned a total average of 10.2l/100km and this was predominately sitting on 2700rpm.

So good was the economy that the DTE read 956km!!! As if! Which brings my question about.

As the speedo is clearly reading well out and therefore is upsetting the DTE does this also mean that my Odometer is increasing at an unrealistic rate??

Sorry for the rambling.