• Explore 32 cars from the built-in R dataset mtcars.
• Compare vehicle weight with fuel economy in miles per US gallon.
• Color identifies the number of cylinders.
• Created October 27, 2026.

Hover over a point for details. Click legend entries to filter; drag to zoom.

• Heavier cars generally have lower fuel economy in this sample.
• Four-cylinder cars tend to occupy the lighter, more efficient part of the chart.
• Weight and fuel economy have a correlation of -0.87.
• This association does not establish causation: engine size and other design choices also vary.

• These are historical cars, not a representative sample of today’s vehicles.
• The dataset contains 32 observations and 11 vehicle characteristics.
• Source: R’s datasets::mtcars, extracted from the 1974 Motor Trend US magazine.
• Dataset documentation: https://stat.ethz.ch/R-manual/R-devel/library/datasets/html/mtcars.html

Return to the chart and double-click a legend entry to isolate a cylinder group.

Which cars combine relatively low weight with high fuel economy?

Double-click the plot area to reset the zoom.