This interactive bubble chart shows the correlation between average horsepower, torque, and highway MPG across 31 car makes, with bubble size encoding MPG and color distinguishing each brand. Hovering reveals a tooltip with the make name. Rendered in SVG with D3 v7, it uses `d3.scaleLinear` for axes and bubble sizing, `d3.scaleOrdinal` with `d3.interpolateTurbo` for colors, and mouse event handlers for tooltip interaction. Data comes from the included `bubblechart.csv`, with a legend for MPG values and make labels.