This line chart visualizes miles per gallon (mpg) for car models, with temperature data from San Francisco sourced via CSV. The chart uses D3 v5’s `scaleBand` and `scaleLinear` for axes, `line` with `curveBasis` for a smoothed path, and `axisBottom` and `axisLeft` for labeled ticks. Data is loaded with `csv` and rendered in SVG via `select`. The chart includes rotated x-axis labels, a title, and axis labels.