This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across 31 car brands. Each circle’s x-position maps to max speed, y-position to acceleration, and size to fuel efficiency, while color encodes the brand. The D3 v7 code (with SVG) uses `d3.scaleLinear` for axes and bubble size, `d3.scaleOrdinal` with `interpolateTurbo` for colors, and interactive tooltips on mouseover. A legend shows MPG values and brand colors, with data loaded from a CSV file.