diff --git a/appsettings.json b/appsettings.json
index cc56a77..af4a60c 100644
--- a/appsettings.json
+++ b/appsettings.json
@@ -13,6 +13,7 @@
   "EnableAuth": false,
   "HideZero": false,
   "UseUKMPG": false,
+  "UseThreeDecimalGasCost": true,
   "UserNameHash": "",
   "UserPasswordHash": ""
 }