This bubble chart shows the correlation between average horsepower, torque, and highway MPG across 31 car makes. Each circle represents a make, positioned by horsepower on the x-axis and torque on the y-axis, with the circle radius encoding highway MPG and color distinguishing each brand via `d3.scaleOrdinal`. The visualization uses `d3.csv` to load data, `d3.axisBottom` and `d3.axisLeft` for axes, and interactive tooltips triggered by mouseover events. A legend with scaled circles and labels explains the MPG encoding. Data is rendered as SVG with color mapping via `d3.interpolateTurbo`.