1991 · Full-Size Pickup · Diesel

1991 GMC Sierra Diesel MPG & fuel economy

The 1991 GMC Sierra Diesel is a full-size pickup offered in 7 EPA-rated configurations. The most efficient version returns 20 MPG combined (18 city / 23 highway) on diesel. Across the lineup, combined ratings range from 16 to 20 MPG. That's up 2 MPG from the 1990 model. Among 27 full-size pickups rated for 1991, it ranks 13th for lowest fuel cost. At 15,000 miles a year with $3.70/gal diesel fuel, it costs about $2,775 a year to fuel.

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Combined 20 MPG 18 MPG city · 23 MPG hwy

Driving range — not published for this model

Your fuel cost $2,775 15,000 mi/yr · $18.50 per 100 mi

Class rank, 1991 #13 of 27 Full-Size Pickups by fuel cost

What will it cost you?

Your mileage and prices are saved and used across the site.

Miles per year Diesel $/gal

Fuel average

The 1991 GMC Sierra Diesel's fuel average is 8.5 km/L (11.8 L/100 km), or 20 MPG combined: 7.7 km/L in the city and 9.8 km/L on the highway.

	MPG	km/L	L/100 km
City	18	7.7	13.1
Highway	23	9.8	10.2
Combined	20	8.5	11.8

How it ranks among 1991 Full-Size Pickups

Full class ranking →

1Mazda B Pickup22 MPG $2,114
2Dodge Dakota Pickup21 MPG $2,214
3Toyota Truck/T10021 MPG $2,214
4Isuzu Pickup20 MPG $2,325
5Mitsubishi Truck19 MPG $2,447
···
13GMC Sierra Diesel20 MPG $2,775
···
27Dodge W250 Pickup11 MPG $4,227

1991 Sierra DieselOther full-size pickupsClass median: $2,906/yr

Annual fuel cost at 15,000 miles and default prices; shorter bars cost less.

Sierra Diesel MPG across model years

Full history →

7 EPA-rated configurations

Configuration	Type	City	Hwy	Combined	Range	Your cost / yr
RWD · 6.2L 8-cyl · 5-speed manual Sierra 1500 2WD	Diesel	18 MPG	23 MPG	20 MPG	—	$2,775
4WD/AWD · 6.2L 8-cyl · 5-speed manual Sierra 2500 4WD	Diesel	17 MPG	21 MPG	18 MPG	—	$3,083
RWD · 6.2L 8-cyl · 4-speed automatic Sierra 1500 2WD	Diesel	16 MPG	22 MPG	18 MPG	—	$3,083
RWD · 6.2L 8-cyl · 4-speed manual Sierra 1500 2WD	Diesel	17 MPG	19 MPG	18 MPG	—	$3,083
4WD/AWD · 6.2L 8-cyl · 5-speed manual Sierra 1500 4WD	Diesel	16 MPG	20 MPG	17 MPG	—	$3,265
4WD/AWD · 6.2L 8-cyl · 4-speed automatic Sierra 1500 4WD	Diesel	15 MPG	19 MPG	16 MPG	—	$3,469
4WD/AWD · 6.2L 8-cyl · 4-speed manual Sierra 1500 4WD	Diesel	15 MPG	17 MPG	16 MPG	—	$3,469

Specs (most efficient configuration)

Fuel: Diesel
Engine / motor: 6.2L 8-cyl
Transmission: 5-speed manual
Drivetrain: RWD
Tailpipe CO₂: 509 g/mi

1991 GMC Sierra Diesel vs. rivals

vs Chevrolet C1500 Pickup Diesel 20 MPG · $2,775/yr Same fuel cost vs Chevrolet C1500 Pickup 17 MPG · $2,735/yr C1500 Pickup saves $40/yr vs Chevrolet C2500 Pickup 17 MPG · $2,735/yr C2500 Pickup saves $40/yr vs Dodge D100/D150 Pickup 16 MPG · $2,906/yr Sierra Diesel saves $131/yr vs Ford F150 16 MPG · $2,906/yr Sierra Diesel saves $131/yr vs Ford F250 16 MPG · $2,906/yr Sierra Diesel saves $131/yr vs Chevrolet K1500 Pickup 16 MPG · $2,906/yr Sierra Diesel saves $131/yr vs Chevrolet K2500 Pickup 16 MPG · $2,906/yr Sierra Diesel saves $131/yr vs Chevrolet C2500 Pickup Diesel 19 MPG · $2,921/yr Sierra Diesel saves $146/yr vs GMC Sierra 17 MPG · $2,735/yr Sierra saves $40/yr

Compare the 1991 Sierra Diesel

With any other car from any year, including other Sierra Diesel model years. Type a year to jump, e.g. "2015 Accord".

Same year, other powertrains: 1991 GMC Sierra (17 MPG)

Frequently asked questions

What is the gas mileage of the 1991 GMC Sierra Diesel?

Up to 20 MPG combined (18 city / 23 highway); ratings range from 16 to 20 MPG depending on configuration.

What fuel does the 1991 GMC Sierra Diesel use?

Diesel.

What is the fuel average in km/L for the 1991 GMC Sierra Diesel?