Use Odemeter (Speedo)

This is an advanced feature that allows you to keep check of the mileage by the use of your vehicle speedometer.  If you tick the Odometer box you will see that you can now enter the mileage.

For example if your speedometer reading is 10 miles when you set out in the morning and then is showing 15 miles when you get to the client you know that you have travelled 5 miles.  If you have set up a standard mileage rate then the figure will be automatically calculated for you and entered into the invoice total.