THE NUMBERS, EXPLAINED
How to use this calculator.
Numeric class codes represent user-defined combinations of route and load band. Within each group, consumption is ratio of total fuel to total distance, not average trip rates.
Start with your inputs
Enter fuel by observed trip (l), trip distances (km), route-load class codes. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Fuel by observed trip (L) | 10,12,20 |
| Trip distances (km) | 100,200,200 |
| Route-load class codes | 1,1,2 |
A worked example
With the example inputs above, class codes is 1, 2. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Class codes | 1, 2 |
| Class consumption (L/100 km) | 7.333333, 10 |
| Whole-fleet consumption (L/100 km) | 8.4 |
How this is calculated
Class codes
List distinct supplied class codes in numeric order.
Class consumption (L/100 km)
For each class divide summed fuel by summed distance and multiply by 100.
Whole-fleet consumption (L/100 km)
Divide all fuel by all distance and multiply by 100.
Symbols and units
- a
- Fuel by observed trip (L)
- b
- Trip distances (km)
- c
- Route-load class codes
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Numeric class codes represent user-defined combinations of route and load band. Within each group, consumption is ratio of total fuel to total distance, not average trip rates.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Class codes; Class consumption (L/100 km); Whole-fleet consumption (L/100 km). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Numeric class codes represent user-defined combinations of route and load band. Within each group, consumption is ratio of total fuel to total distance, not average trip rates.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: Solve proportions and their applications ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
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