This scatter plot visualizes the relationship between engine size (liters) and fuel efficiency (mpg) for car models across ten brands, using color to distinguish each manufacturer. It shows the expected tradeoff: larger engines generally achieve lower fuel efficiency. The visualization is built with D3.js, using reusable chart components with `d3.scaleLinear` for the x and y axes, `d3.scaleOrdinal` with `d3.schemeTableau10` for color encoding, and `d3.axisBottom`/`d3.axisLeft` for ticks. The data comes from a local CSV file, rendered as an SVG with circles and a stacked legend.