Gap Insurance

Insurance coverage within a leased vehicle which protects policyholders and lessers from any risks not included with the policy. The “gap” covered by this type of insurance usually includes the total amount a lessee’s insurance will pay to a lesser if the vehicle is fully destroyed or stolen. It will also pay for the total remaining amount the lessee owes to the leasing company as per the terms of the agreement. This gap coverage ensures that a lessee will not have to continue making lease payments in the event that a car is fully destroyed or stolen.

Gas Guzzler Tax

Graduated federal tax which is included as part of a new vehicle’s purchase price when that particular model has an especially poor fuel economy. The tax can help dissuade buyers from purchasing vehicles within inefficient fuel consumption.

Gas and Electric Hybrid Engine

A powertrain which combines both a gasoline-based combustion or diesel engine alongside an electrical motor. Hybrid engines will typically utilize electric power unless its charge is too low or the current driving demands require more power than electric can provide.

Gasoline Engine

Internal combustion engine which consumes traditional gasoline to power the vehicle.


Refer to “Instrumentation” for more information.


An area of a vehicle which is located above its beltline. This position will vary depending on particular vehicle’s design.

Greenhouse Gas Score

Score provided by the EPA which reflects the total number of greenhouse gases a new vehicle emits during standard operation. The test is independently conducted in a laboratory driving simulation. The score numbers range from 0 to 10, with 0 representing high levels of pollutants and 10 representing exceptionally clean greenhouse gas emissions. This score is one of several EPA-based tests which provide an objective assessment of a vehicle’s environmental impact.

Greenhouse Gases

A number of gases produced by vehicles which use hydrocarbons like gasoline and ethanol as fuel. Typical gases in vehicle emissions include carbon monoxide, carbon dioxide, nitrous oxide, methane, and hydrofluorocarbons. The gases absorb and emit radiation which may cause a myriad of environmental consequences. EPA testing and standardization helps to reduce emissions and inform consumers of their vehicle’s potential environmental impact.

Gross Vehicle Weight Rating

Also known as the “GVWR,” a figure which represents the total sum of all the weight capacity a vehicle can accommodate. Sums are derived from the curb weight, passenger weight capacity, and the cargo weight capacity. The total can help prospective buyers understand the maximum loads a vehicle can safely carry.

Ground Clearance

The total distance from the lowest point of a vehicle’s chassis and level ground. This number is used to determine safe vehicle operation for lower-riding models.


Refer to “Gross Vehicle Weight Rating” for more information.

Gyro Sensor

A device equipped in a vehicle as part of the navigation system to help determine the specific direction it is facing. Gyro-equipped navigation can significantly improve accuracy within a vehicle’s guidance system.