diff --git a/nrel/routee/powertrain/core/powertrain_type.py b/nrel/routee/powertrain/core/powertrain_type.py
index 0d84775..3d00930 100644
--- a/nrel/routee/powertrain/core/powertrain_type.py
+++ b/nrel/routee/powertrain/core/powertrain_type.py
@@ -11,6 +11,7 @@ class PowertrainType(Enum):
     BEV = 3
     PHEV_EV_MODE = 4
     PHEV_HEV_MODE = 5
+    HEAVY_DUTY = 6
 
     @classmethod
     def from_string(cls, s: Optional[str]) -> PowertrainType:
diff --git a/nrel/routee/powertrain/core/real_world_adjustments.py b/nrel/routee/powertrain/core/real_world_adjustments.py
index 5f87907..dcab3fc 100644
--- a/nrel/routee/powertrain/core/real_world_adjustments.py
+++ b/nrel/routee/powertrain/core/real_world_adjustments.py
@@ -9,4 +9,5 @@
     PowertrainType.BEV: 1.3958,
     PowertrainType.PHEV_EV_MODE: 1.3958,
     PowertrainType.PHEV_HEV_MODE: 1.1252,
+    PowertrainType.HEAVY_DUTY: 1.0,
 }
diff --git a/pyproject.toml b/pyproject.toml
index ca2cf57..4c7b3ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "nrel.routee.powertrain"
-version = "1.1.0"
+version = "1.1.1"
 description = "RouteE-Powertrain is a tool for predicting energy usage over a set of road links."
 readme = "README.md"
 authors = [{ name = "National Renewable Energy Laboratory" }]