This visualization displays the relationship between fuel efficiency (mpg), horsepower, and weight for a sample of automobiles, colored by country of origin. Using the Vega-Lite API with D3.js for data loading, it renders a scatter plot where circle size encodes vehicle weight and tooltips reveal the car model name. The data comes from the UCI Machine Learning Repository's Auto MPG dataset, loaded via `d3.csv`. The visualization pipeline combines `vl.markCircle`, `vl.x`, and `vl.y` encodings with a custom configuration for styling and tooltip handling.