This interactive scatter plot visualizes the relationship between fuel efficiency (mpg), horsepower, weight, and country of origin for automobiles from the UCI Auto MPG dataset. The visualization uses the Vega-Lite API to declaratively encode data fields onto circular marks, with color distinguishing origin and size mapping to weight. It reads CSV data via `d3.csv`, renders with Vega’s SVG renderer, and includes Vega-Tooltip for interactive hover details. The chart resizes to fit the browser window and applies custom axis and label styling for readability.