This bubble chart visualizes the relationship between average horsepower, torque, and highway MPG across 30 car makes, using position for the quantitative axes and circle size for fuel efficiency. Each bubble represents a make, colored by a categorical ordinal scale using `d3.interpolateTurbo`, with hover tooltips showing the make name. The chart is rendered as SVG with D3 v7, using `d3.scaleLinear` for axes and a legend that encodes MPG values through circle size.