diff --git a/Engines/cfm56_5a1_1.xml b/Engines/cfm56_5a1_1.xml
index 67147044..4bf2fbe7 100644
--- a/Engines/cfm56_5a1_1.xml
+++ b/Engines/cfm56_5a1_1.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="CFM56_5A1">
 	
 	<milthrust>     25000 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/cfm56_5a1_2.xml b/Engines/cfm56_5a1_2.xml
index 122236e0..beff2f2f 100644
--- a/Engines/cfm56_5a1_2.xml
+++ b/Engines/cfm56_5a1_2.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="CFM56_5A1">
 	
 	<milthrust>     25000 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/cfm56_5b4_1.xml b/Engines/cfm56_5b4_1.xml
index e6c4ec41..c831a9e5 100644
--- a/Engines/cfm56_5b4_1.xml
+++ b/Engines/cfm56_5b4_1.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="CFM56_5B4">
 	
 	<milthrust>     27000 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/cfm56_5b4_2.xml b/Engines/cfm56_5b4_2.xml
index 81acffd7..618842af 100644
--- a/Engines/cfm56_5b4_2.xml
+++ b/Engines/cfm56_5b4_2.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="CFM56_5B4">
 	
 	<milthrust>     27000 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/leap1a26_1.xml b/Engines/leap1a26_1.xml
index 534e076e..2433ccac 100644
--- a/Engines/leap1a26_1.xml
+++ b/Engines/leap1a26_1.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="LEAP1A26">
 	
 	<milthrust>     27000 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/leap1a26_2.xml b/Engines/leap1a26_2.xml
index f2930ec3..52165b3f 100644
--- a/Engines/leap1a26_2.xml
+++ b/Engines/leap1a26_2.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="LEAP1A26">
 	
 	<milthrust>     27000 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/pw1127g_1.xml b/Engines/pw1127g_1.xml
index 8d13b1c6..56e09cab 100644
--- a/Engines/pw1127g_1.xml
+++ b/Engines/pw1127g_1.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="PW1127G">
 	
 	<milthrust>     26345 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/pw1127g_2.xml b/Engines/pw1127g_2.xml
index 3a487ef4..43049c01 100644
--- a/Engines/pw1127g_2.xml
+++ b/Engines/pw1127g_2.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="PW1127G">
 	
 	<milthrust>     26345 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         19.7 </idlen1>
 	<idlen2>         61.2 </idlen2>
diff --git a/Engines/v2527_a5_1.xml b/Engines/v2527_a5_1.xml
index aaaf9ada..b3ac4d6b 100644
--- a/Engines/v2527_a5_1.xml
+++ b/Engines/v2527_a5_1.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="V2527_A5">
 	
 	<milthrust>     26600 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         22.4 </idlen1>
 	<idlen2>         60.9 </idlen2>
diff --git a/Engines/v2527_a5_2.xml b/Engines/v2527_a5_2.xml
index 2494b0d5..f7b1c318 100644
--- a/Engines/v2527_a5_2.xml
+++ b/Engines/v2527_a5_2.xml
@@ -5,7 +5,7 @@
 <turbine_engine name="V2527_A5">
 	
 	<milthrust>     26600 </milthrust>
-	<tsfc>            0.5 </tsfc>
+	<tsfc>           0.41 </tsfc>
 	<bleed>          0.03 </bleed>
 	<idlen1>         22.4 </idlen1>
 	<idlen2>         60.9 </idlen2>
diff --git a/revision.txt b/revision.txt
index 295e96b2..aeb1e712 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-4727
\ No newline at end of file
+4728
\ No newline at end of file