THE RESULT
What the data shows
The largest computed metric is 28.25 for 4.0; the smallest is 14 for 8.0. Metric: median_mpg (Miles per US gallon).
Rare cylinder groups have few observations. Missing horsepower is not filled for descriptive medians.
| cylinders | vehicles | median mpg | median weight | median horsepower |
|---|---|---|---|---|
| 3 | 4 | 20.25 | 2,375 | 98.5 |
| 4 | 204 | 28.25 | 2,232 | 78 |
| 5 | 3 | 25.4 | 2,950 | 77 |
| 6 | 84 | 19 | 3,201.50 | 100 |
| 8 | 103 | 14 | 4,140 | 150 |
THE METHOD
From source to answer
Cylinder-level sample sizes and median specifications.
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
Evaluate comparable vehicle configurations rather than interpreting a cylinder category as an isolated cause.
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.