dp.Djellon Pllana
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PROJECT 072 / 102 · Mobility

Origin and model-year composition.

Does the origin comparison change when model years are grouped into comparable periods?

Focused analytical studyFuel economyExecuted notebook

THE RESULT

What the data shows

The largest computed metric is 33.48 for (77, 82] / origin 3; the smallest is 16.03 for (69, 73] / origin 1. Metric: mean_mpg (Miles per US gallon).

Origin codes are source categories, not a measure of driver behavior or modern national fleets.

Origin and model-year composition — chart from the computed study output
Computed study output. Full values and units are available in the results download.
Computed results · 9 of 9 rows. Values rounded for display; source units and raw column names are retained in the download.
periodoriginvehiclesmean mpggroup
(69, 73]18916.03(69, 73] / origin 1
(69, 73]22124.71(69, 73] / origin 2
(69, 73]31524.67(69, 73] / origin 3
(73, 77]17519.02(73, 77] / origin 1
(73, 77]22425.83(73, 77] / origin 2
(73, 77]32028.12(73, 77] / origin 3
(77, 82]18525.26(77, 82] / origin 1
(77, 82]22532.54(77, 82] / origin 2
(77, 82]34433.48(77, 82] / origin 3
Download the complete result table ↓

THE METHOD

From source to answer

Origin-stratified model-year bands with sample counts.

The Python source exposes this study’s transformations. The complete project download includes shared preparation and evaluation routines.

THE NEXT DECISION

What follows from the finding

Check composition before presenting geographical comparisons of efficiency.

Where the conclusion stops

Historical city-cycle vehicle observations are not current fleet performance. Vehicle mix and model year are confounded. A '?' horsepower value means missing, not zero.

Related studies may reuse observations or holdouts. These are historical analyses; associations and backtests do not demonstrate commercial impact. Further model tuning needs new, untouched evaluation data.