Fix liter per 100 km calculation for multiple cars

src/Vegasco.Server.Api/Consumptions/GetConsumptions.cs

@@ -51,13 +51,16 @@ public static class GetConsumptions
 		ApplicationDbContext dbContext,
 		CancellationToken cancellationToken)
 	{
-		List<Consumption> consumptions = await dbContext.Consumptions
+		Dictionary<CarId, List<Consumption>> consumptionsByCar = await dbContext.Consumptions
 			.OrderByDescending(x => x.DateTime)
 			.Include(x => x.Car)
-			.ToListAsync(cancellationToken);
+			.GroupBy(x => x.CarId)
+			.ToDictionaryAsync(x => x.Key, x => x.ToList(), cancellationToken);
 
 		List<ResponseDto> responses = [];
 
+		foreach (var consumptions in consumptionsByCar.Select(x => x.Value))
+		{
 			for (int i = 0; i < consumptions.Count; i++)
 			{
 				Consumption consumption = consumptions[i];
@@ -80,6 +83,7 @@ public static class GetConsumptions
 					CarDto.FromCar(consumption.Car),
 					literPer100Km));
 			}
+		}
 
 		ApiResponse apiResponse = new() { Consumptions = responses };
 		return TypedResults.Ok(apiResponse);