Explanation

• We load your CSV from Gist and aggregate a count per Type (Sedan, SUV, Truck, Coupe).
• The pie shows each type’s share of the dataset. Labels show Type + %.
• Legend squares use the same colors as slices and sit beside the chart (per requirement).

To plot a quantitative sum instead of counts (e.g., sum of Price by Type), change metric = g => g.length to metric = g => d3.sum(g, d => d.Price).