This bubble chart compares vehicle makes by engine horsepower, torque, and highway fuel efficiency. The x-axis maps average horsepower, the y-axis maps average torque, and the radius of each bubble encodes highway miles per gallon, scaled via `d3.scaleSqrt`. The visualization uses an SVG canvas with `d3.axisBottom` and `d3.axisLeft` for axes. Data comes from the included `bubblechart.csv`, which aggregates metrics per manufacturer. The chart uses `d3.select` and `.append('circle')` to render each bubble with a fixed opacity of 0.7. A legend and axis labels are drawn using SVG text elements.