Wierd odometer readings

[the_phoenix]

I got my car back from the workshop and filled with fuel and calculated my distance driven based on odometer not tripmeter seeing the battery was disconnected. I got a figure of 712km which is not possible, seeing at about 450km I'm often out of fuel. This perplexed me, so I looked through my logs and discovered a variance throughout.

There seems to be a 3.5% difference between odometer and tripmeter readings. Is that normal? I cannot see how this is possible seeing I assume they both run off the gear box speed sensor.

Anyone else noticed phenomena like this?

 

[Richard]

Every time you reset it after you fill up or when ever, the .4 or .9 etc dissapears from trip meter / your calculations, however it is still counted on the odometer??

 

[the_phoenix]

I'm just interested in why those figures are what they are.