From f8ecda1d5bd14bc56d8b5bd11cf068e4ea17e63f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 19 Feb 2026 16:56:04 +0000
Subject: [PATCH 1/2] Initial plan


From 5153b66bbb6d574231bf6a4c414c5c78b9e042d7 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Thu, 19 Feb 2026 17:00:30 +0000
Subject: [PATCH 2/2] Add gradient aware pacing

Co-authored-by: simonech <61557+simonech@users.noreply.github.com>
---
 VirtualSpeed/VirtualSpeed/Program.cs          |  6 ++++-
 .../VirtualSpeed/Services/RideCalculator.cs   | 22 +++++++++++++++++--
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/VirtualSpeed/VirtualSpeed/Program.cs b/VirtualSpeed/VirtualSpeed/Program.cs
index 96c54d9..c2578d0 100644
--- a/VirtualSpeed/VirtualSpeed/Program.cs
+++ b/VirtualSpeed/VirtualSpeed/Program.cs
@@ -67,11 +67,15 @@ static void Main(string[] args)
             double avgSpeedKmh = totalTimeSeconds > 0
                 ? (totalDistance / totalTimeSeconds) * 3.6
                 : 0;
+            double avgPowerWatts = totalTimeSeconds > 0
+                ? rideSegments.Sum(r => r.PowerWatts * r.DurationSeconds) / totalTimeSeconds
+                : 0;
 
             Console.WriteLine($"Total Distance: {totalDistance:F0} m");
             Console.WriteLine($"Total Elevation Gain: {totalElevationGain:F0} m");
             Console.WriteLine($"Total Time: {TimeSpan.FromSeconds(totalTimeSeconds):hh\\:mm\\:ss}");
             Console.WriteLine($"Avg Speed: {avgSpeedKmh:F1} km/h");
+            Console.WriteLine($"Avg Power: {avgPowerWatts:F1} W");
             Console.WriteLine();
             Console.WriteLine("Segments:");
 
@@ -79,7 +83,7 @@ static void Main(string[] args)
             {
                 var seg = ride.RouteSegment;
                 double gradientPct = seg.AverageGradient * 100;
-                Console.WriteLine($"{seg.StartDistanceMeters:F0}m - {seg.StartDistanceMeters + seg.LengthMeters:F0}m | Gradient: {gradientPct:F1}% | Speed: {ride.SpeedKmh:F1} km/h | Time: {ride.DurationSeconds:F0} s");
+                Console.WriteLine($"{seg.StartDistanceMeters:F0}m - {seg.StartDistanceMeters + seg.LengthMeters:F0}m | Gradient: {gradientPct:F1}% | Power: {ride.PowerWatts:F0} W | Speed: {ride.SpeedKmh:F1} km/h | Time: {ride.DurationSeconds:F0} s");
             }
         }
     }
diff --git a/VirtualSpeed/VirtualSpeed/Services/RideCalculator.cs b/VirtualSpeed/VirtualSpeed/Services/RideCalculator.cs
index 2c12fb9..eb21fe1 100644
--- a/VirtualSpeed/VirtualSpeed/Services/RideCalculator.cs
+++ b/VirtualSpeed/VirtualSpeed/Services/RideCalculator.cs
@@ -12,6 +12,23 @@ public RideCalculator(Parameters parameters)
             _parameters = parameters;
         }
 
+        public static double GetGradientPacingMultiplier(double gradient)
+        {
+            double gradientPct = gradient * 100.0;
+
+            if (gradientPct < -5.0)
+                return 0.85;
+            if (gradientPct < -1.0)
+                return 0.90;
+            if (gradientPct < 1.0)
+                return 1.00;
+            if (gradientPct < 3.0)
+                return 1.02;
+            if (gradientPct < 6.0)
+                return 1.07;
+            return 1.10;
+        }
+
         public IReadOnlyList<RideSegment> Calculate(IReadOnlyList<RouteSegment> routeSegments, double powerWatts)
         {
             var rideSegments = new List<RideSegment>();
@@ -19,11 +36,12 @@ public IReadOnlyList<RideSegment> Calculate(IReadOnlyList<RouteSegment> routeSeg
 
             foreach (var routeSegment in routeSegments)
             {
-                double speedKmh = calculator.CalculateVelocity(powerWatts, routeSegment.AverageGradient);
+                double adjustedPower = powerWatts * GetGradientPacingMultiplier(routeSegment.AverageGradient);
+                double speedKmh = calculator.CalculateVelocity(adjustedPower, routeSegment.AverageGradient);
                 double speedMs = calculator.ConvertKmhToMS(speedKmh);
                 double durationSeconds = speedMs > 0 ? routeSegment.LengthMeters / speedMs : 0;
 
-                rideSegments.Add(new RideSegment(durationSeconds, speedKmh, powerWatts, routeSegment));
+                rideSegments.Add(new RideSegment(durationSeconds, speedKmh, adjustedPower, routeSegment));
             }
 
             return rideSegments;