diff --git a/Nasal/FMGC/FMGC.nas b/Nasal/FMGC/FMGC.nas
index 8a071448..b44bccad 100644
--- a/Nasal/FMGC/FMGC.nas
+++ b/Nasal/FMGC/FMGC.nas
@@ -214,9 +214,8 @@ var updateFuel = func {
 	# Calculate trip fuel
 	if (getprop("/FMGC/internal/tofrom-set") and getprop("/FMGC/internal/cruise-lvl-set") and getprop("/FMGC/internal/cruise-temp-set")) {
 		crz = getprop("/FMGC/internal/cruise-fl");
-		temp = getprop("/FMGC/internal/cruise-temp-set");
-		isa = 15 - (2 * num(crz) / 10);
-		dist = flightPlanController.arrivalDist + (0.03306933933 * (temp - isa) * flightPlanController.arrivalDist);
+		temp = getprop("/FMGC/internal/cruise-temp");
+		dist = flightPlanController.arrivalDist + (0.03306933933 * (temp - 15 + (2 * crz / 10)) * flightPlanController.arrivalDist);
 		trip_fuel = 400.3 + (dist * -53.99) + (dist * dist * -0.07322) + (dist * dist * dist * 0.00001091) + (dist * dist * dist * dist * 0.00000000002962) + (dist * dist * dist * dist * dist * -0.0000000000001178) + (dist * dist * dist * dist * dist * dist * 0.000000000000000006322) + (crz * 53.87) + (dist * crz * 1.583) + (dist * dist * crz * 0.0007695) + (dist * dist * dist * crz * -0.0000001057) + (dist * dist * dist * dist * crz * 0.000000000001138) + (dist * dist * dist * dist * dist * crz * 0.0000000000000001736) + (crz * crz * -1.171) + (dist * crz * crz * -0.01219) + (dist * dist * crz * crz * -0.000002879) + (dist * dist * dist * crz * crz * 0.0000000003115) + (dist * dist * dist * dist * crz * crz * -0.000000000000004093) + (crz * crz * crz * 0.009160) + (dist * crz * crz * crz * 0.00004311) + (dist * dist * crz * crz * crz * 0.000000004532) + (dist * dist * dist * crz * crz * crz * -0.0000000000002879) + (crz * crz * crz * crz * -0.00003338) + (dist * crz * crz * crz * crz * -0.00000007340) + (dist * dist * crz * crz * crz * crz * -0.000000000002494) + (crz * crz * crz * crz * crz * 0.00000005849) + (dist * crz * crz * crz * crz * crz * 0.00000000004898) + (crz * crz * crz * crz * crz * crz * -0.00000000003999);
 		setprop("/FMGC/internal/trip-fuel", trip_fuel / 1000);
 	} else {