Acronym Definitions
ALVW Adjusted Loaded Vehicle WeightBBL Barrel
CALIFORNIA ARB California Air Resource Board
CARB California Air Resource Board
CARB LEV Low Emission Vehicle
CARB TLEV Transitional Low Emission Vehicle
CARB ULEV Ultra Low Emission Vehicle
CARB ZEV Zero Emission Vehicle
CPI Central Port Injection
CI Cylinder Injection
CNG Compressed Natural Gas
EPA Environmental Protection Agency
EVAP Evaporative Emissions
GVW Gross Vehicle Weight
GVWR Gross Vehicle Weight Rating
HHDE Heavy Heavy Duty Engine
HHDDE Heavy Heavy Duty Diesel Engine
MHDE Medium Heavy Duty Diesel Engine
MPI Multi Port Injection
LDDT Light Duty Diesel Truck
LDT Light Duty Truck (gasoline)
LDV Light Duty Vehicle
LHDE Light Heavy Duty Engine
LVW Loaded Vehicle Weight
MDT Medium Duty Truck
MDV Medium Duty Vehicle
MHDE Medium Heavy Duty Engine
MY Model Year
NCP Non Compliance Penalty
OBD On-Board Diagnostic
ORVR On-Board Refueling Vapor Recovery
PC Passenger Car
SI Sequential Injection
SULEV Super Ultra Low Emission Vehicle
Tier 0 California and Federal regulations effective prior to Tier 1 phase in dates
Tier 1 California regulations beginning in 1993 model year and Federal regulations beginning in 1994 model year
TBI Throttle Body Injection
LEV Low Emission Vehicle
ZEV Zero Emission Vehicle
ULEV Ultra Low Emission Vehicle
ILEV Inherently Low Emission Vehicle
[1] (Curb Weight + GVWR) /2. Averaging Bank/Trade-Used for Nox Credits on Heavy Duty Trucks Only.