This bubble chart shows the correlation between average horsepower, torque, and highway MPG across 31 car makes, with each make’s circle size encoding highway MPG and color encoding make identity. The visualization uses a CSV dataset loaded via `d3.csv`, with linear scales for both axes and a size scale for the circles. Interactive tooltips appear on mouseover, and the chart includes a legend showing the MPG scale and color mappings. The SVG is rendered with D3 v7, using joins for circles and mouse event handlers for tooltip positioning.