1991 GMC Sierra 2500 4WD MPG and Fuel Economy

On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 1991 GMC Sierra 2500 4WD.

The 1991 GMC Sierra 2500 4WD runs on diesel and is in the Standard Pickup Trucks 4WD car class.

Whether you are considering a purchase of the car, or just wanting to find out how economical and environmentally friendly (or un-friendly) your 1991 GMC Sierra 2500 4WD is, we have the information you need.

🛣 How Many Miles per Gallon (MPG) Does a 1991 GMC Sierra 2500 4WD Get?

First off, the most commonly asked question. A 1991 GMC Sierra 2500 4WD gets up to 17 miles per gallon in the city, and 21 miles per gallon on the highway.

The combined average MPG for the 1991 GMC Sierra 2500 4WD is 18 miles per gallon.

💵 What is the Average Yearly Fuel Cost for a 1991 GMC Sierra 2500 4WD?

The estimated fuel costs for the 1991 GMC Sierra 2500 4WD is $4,300 per year.

That value has been estimated by government regulators based on 15,000 miles driven per year, using regular gasoline, and a split of 55% city driving and 45% highway driving.

If you were to compare a 1991 GMC Sierra 2500 4WD to an average vehicle over 5 years, you will spend $10,000 more on fuel.

🛢 How Many Barrels of Petroleum Does a 1991 GMC Sierra 2500 4WD Consume?

The 1991 GMC Sierra 2500 4WD will consume roughly 20 barrels of petroleum per year, using the standard estimate of 15,000 miles per year.

The majority of the world's petroleum is sourced from countries like Saudi Arabia, Russia, Iraq, and the United States.

Overview

The table below covers all of the miles per gallon, engine specifications, and emission details we have for the 1991 GMC Sierra 2500 4WD.

City MPG17
Highway MPG21
Combined MPG18
Save/Spend vs Average CarSpend $10,000
Fuel Cost$4,300
Fuel Type 1Diesel
ATV TypeDiesel
Barrels of Petroleum20
Drive4-Wheel or All-Wheel Drive
Cylinders8
Displacement6.2
TransmissionManual 5-spd
Vehicle ClassStandard Pickup Trucks 4WD
Start/Stop?No
Supercharged?No
Turbocharged?No

Related GMC Models from 1991

If you're interested in other GMC models from 1991, you can find them in the table below. You can click the model link to find miles per gallon and emission information for that model.

Link To or Reference This Page

If you use this page in your research, please reference MPG Buddy as the source.

  • "1991 GMC Sierra 2500 4WD MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/gmc/sierra-2500-4wd/1991.

  • "1991 GMC Sierra 2500 4WD MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/gmc/sierra-2500-4wd/1991. Accessed January 3, 2026.

  • 1991 GMC Sierra 2500 4WD MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/gmc/sierra-2500-4wd/1991.