I would like to be able to track my mileage. This should be possible with both mile and kilometers. The rate per mile should be set by the administrator, as per their country’s rate. It should be possible for non-administrators to record their mileage (though I won’t need it personally) and that privilege be set by the administrator.

Mileage tracking should include:
fuel cost per litre (and maybe something)
vehicles mileage
the destinations
and distance travelled

This should all be totalled per user and the distances and costs should be totalled over a period of time so users can see how much they have driven between any two dates and how much they can claim from their employer/contractor or from the government.

Ideally this would be possible via Twitter as is currently possible using www.mymilemarker.com