diff --git a/addons/advanced_fatigue/ACE_Settings.hpp b/addons/advanced_fatigue/ACE_Settings.hpp
index ec37bb0275f..8abdcc5865b 100644
--- a/addons/advanced_fatigue/ACE_Settings.hpp
+++ b/addons/advanced_fatigue/ACE_Settings.hpp
@@ -40,6 +40,6 @@ class ACE_Settings {
         displayName = CSTRING(TerrainGradientFactor);
         description = CSTRING(TerrainGradientFactor_Description);
         typeName = "SCALAR";
-        value = 0.5;
+        value = 1;
     };
 };
diff --git a/addons/advanced_fatigue/functions/fnc_handlePlayerChanged.sqf b/addons/advanced_fatigue/functions/fnc_handlePlayerChanged.sqf
index 357e6b29096..f41499e7113 100644
--- a/addons/advanced_fatigue/functions/fnc_handlePlayerChanged.sqf
+++ b/addons/advanced_fatigue/functions/fnc_handlePlayerChanged.sqf
@@ -56,6 +56,7 @@ GVAR(muscleDamage)    = _newUnit getVariable [QGVAR(muscleDamage), 0];
 GVAR(VO2Max)          = 35 + 20 * (_newUnit getVariable [QGVAR(performanceFactor), GVAR(performanceFactor)]);
 GVAR(VO2MaxPower)     = GVAR(VO2Max) * SIM_BODYMASS * BIOMECH_EFFICIENCY * JOULES_PER_ML_O2 / 60;
 GVAR(peakPower)       = VO2MAX_STRENGTH * GVAR(VO2MaxPower);
+GVAR(wattsPerATP)     = (1.81587 * exp(0.0244186 * GVAR(VO2Max))) / ANTPERCENT;
 
 GVAR(ae1PathwayPower) = GVAR(peakPower) / (13.3 + 16.7 + 113.3) * 13.3 * ANTPERCENT ^ 1.28 * 1.362;
 GVAR(ae2PathwayPower) = GVAR(peakPower) / (13.3 + 16.7 + 113.3) * 16.7 * ANTPERCENT ^ 1.28 * 1.362;
diff --git a/addons/advanced_fatigue/functions/fnc_mainLoop.sqf b/addons/advanced_fatigue/functions/fnc_mainLoop.sqf
index 3ba70cc8046..f209e2e9c72 100644
--- a/addons/advanced_fatigue/functions/fnc_mainLoop.sqf
+++ b/addons/advanced_fatigue/functions/fnc_mainLoop.sqf
@@ -55,9 +55,9 @@ private _ae2Power = ((_currentWork - _ae1Power) max 0) min _ae2PathwayPowerFatig
 private _anPower  = (_currentWork - _ae1Power - _ae2Power) max 0;
 
 // Remove ATP from reserves for current work
-GVAR(ae1Reserve) = GVAR(ae1Reserve) - _ae1Power / WATTSPERATP;
-GVAR(ae2Reserve) = GVAR(ae2Reserve) - _ae2Power / WATTSPERATP;
-GVAR(anReserve)  = GVAR(anReserve)  -  _anPower / WATTSPERATP;
+GVAR(ae1Reserve) = GVAR(ae1Reserve) - _ae1Power / GVAR(wattsPerATP);
+GVAR(ae2Reserve) = GVAR(ae2Reserve) - _ae2Power / GVAR(wattsPerATP);
+GVAR(anReserve)  = GVAR(anReserve)  -  _anPower / GVAR(wattsPerATP);
 #ifdef DEBUG_MODE_FULL
 systemChat format["---- ae2: %1 ----", (GVAR(ae2Reserve) / AE2_MAXRESERVE) toFixed 2];
 systemChat format["---- an: %1 ----", (GVAR(anReserve) / AN_MAXRESERVE) toFixed 2];
diff --git a/addons/advanced_fatigue/script_component.hpp b/addons/advanced_fatigue/script_component.hpp
index 3f1379f99a3..856f05c4f6e 100644
--- a/addons/advanced_fatigue/script_component.hpp
+++ b/addons/advanced_fatigue/script_component.hpp
@@ -22,8 +22,7 @@
 #define VO2MAX_STRENGTH 4.1
 #define BIOMECH_EFFICIENCY 0.23
 #define REE 18.83 //((0.5617 * SIM_BODYMASS + 42.57) * BIOMECH_EFFICIENCY)
-#define OXYGEN 0.9
-#define WATTSPERATP 7
+#define OXYGEN 0.878
 
 #define AE1_MAXRESERVE 4000000 // mmol
 #define AE2_MAXRESERVE   84000 // mmol