If the costing procedure for vehicles is maintained correctly, you can display consumption data for the vehicle. This section describes what data is determined and how it is calculated. For more information, see Fleet Management.

The system determines the following data:

·
**Total
counter reading of the primary counter**

The system determines the overall counter reading for the primary counter from the measurement document last entered for this counter.

·
**Total
counter reading of the consumption-relevant fuel counter**

The system determines the overall counter reading for the consumption-relevant fuel counter from the measurement document last entered for this counter.

·
**Average
daily vehicle activity** (for example, the distance traveled in kilometers
per day) in the long and short term

The calculation of average values for the short and
long periods defined in the costing procedure is determined using the first
and last measurement documents within this period. For this reason, there must
be **at least two measurement documents** for a counter within the period
to give a difference between the start and end value (from which the
respective average values are calculated). In addition, both of these
documents must have a different date as their measurement times.

Note that the measurement value of
the first document is always taken as the initial value for showing the
difference, but is not, however, itself entered in the calculation of the
average values. In Example: Calculation
of Consumption Data, the example is concerned with the measurement
documents of January 01. If you also want to include this document in the
calculation, you must first create an **initial document** ("zero
document", in the case of a new vehicle) as the parent document (for the start
date of the productive use of the vehicle), for example:

· Parent document for the primary counter: 01 January: 0 km

· Parent document for the fuel counter: 01 January: 0 l

In order to calculate the average daily fleet object activity, the system first determines the start of the period for which the data should be determined.

In the case of a **short-term**
analysis, the start of the period is the current date minus the number of days
for the short-term period. You have assigned this number of days to the
calculation method in Customizing.

In the case of a **long-term**
analysis, the start of the period is the current date minus the number of days
for the long-term period. You have assigned this number of days to the
calculation method in Customizing.

The average daily consumption of the vehicle is calculated

¡
From the
**first** recorded measurement document after the beginning of the period
(for the primary counter)

¡ And from the last recorded measurement document after the beginning of the period (for the primary counter)

The number of days between the entry dates for these documents is chosen as the time interval.

**The following formula is used for
the calculation: **

Average daily activity = (Overall counter reading for the last measurement document – Overall counter reading for the first measurement document after the start of the period) / Number of days between the entry dates for both documents

·
**Average daily fuel consumption
**(for example, liters per day) in the short and long
term

In order to calculate the quantity of fuel consumed daily, the system first determines the start of the period for which the data should be determined.

In the case of a **short-term**
analysis, the start of the period is the current date minus the number of days
for the short-term period. You have assigned this number of days to the
calculation method in Customizing.

In the case of a **long-term**
analysis, the start of the period is the current date minus the number of days
for the long-term period. You have assigned this number of days to the
calculation method in Customizing.

The average daily fuel consumption is calculated

¡ From the first recorded measurement document after the beginning of the period (for the consumption-relevant fuel counter)

¡ From the last recorded measurement document after the beginning of the period (for the consumption-relevant fuel counter)

The number of days between the entry dates for these documents is chosen as the time interval.

**The following formula is used for
the calculation: **

Average daily consumption = (Overall counter reading for the last measurement document – Overall counter reading for the first measurement document after the start of the period) / Number of days between the entry dates for both documents

·
**Average vehicle consumption **(for example, how many liters on average does the vehicle consume
per 62.14 mi? How many liters does the vehicle consume on average per
operating hour? How many miles on average can a vehicle travel with 100 liters
of fuel?)

In order to calculate the average consumption for the fleet object, the system first determines the start of the period for which the data should be determined.

In the case of a **short-term**
analysis, the start of the period is the current date minus the number of days
for the short-term period. You have assigned this number of days to the
calculation method in Customizing.

In the case of a **long-term**
analysis, the start of the period is the current date minus the number of days
for the long-term period. You have assigned this number of days to the
calculation method in Customizing.

Next, the **first** and
**last** measurement documents recorded after the beginning of the period
are determined for the consumption-relevant fuel counter. The difference
between the overall counter readings for these measurement documents is
displayed. In addition, the
system searches for the measurement document of the primary counter that was
recorded closest in time for both of these measurement documents. The
difference between the overall counter readings is also displayed in this
case. The average consumption is calculated from the quotient of both
differences. The unit is expressed in the units that you have assigned to the
costing method selected.

In order to ensure the precise
calculation of these consumption values, you must enter a measurement document
for the primary counter **close in time** for each measurement document
entered for the consumption-relevant fuel counter in your system. Ideally, when you refuel the
vehicle you should record the kilometer reading, and so on, **at the same
time**.

You can use the original measurement value recording
or the consumption-relevant
counter-reading recording to record the measurement documents. The latter
alternative allows you to perform an integrated (simultaneous) recording of
**all** the measurement documents required for the consumption recording of
a vehicle.

·
**Next
Planned Maintenance Date**

The next maintenance date and the number of the maintenance order are only displayed if you set the maintenance planning.

All average values are calculated as an average of a long and a short period, the exact length of which is defined in Customizing. You can use the comparison of long-term and short-term analysis values to detect damages to the vehicle (for example, a leak or a faulty engine) or to recognize misuse.

For further information on prerequisites, see Fleet Management and Calculating the Consumption Data for “Miles per Gallon”.