2020 · Full-Size Pickup · Diesel

2020 GMC Sierra Diesel MPG & fuel economy

The 2020 GMC Sierra Diesel is a full-size pickup offered in 2 EPA-rated configurations. The most efficient version returns 26 MPG combined (23 city / 30 highway) on diesel. Across the lineup, combined ratings range from 24 to 26 MPG. Among 16 full-size pickups rated for 2020, it ranks 6th for lowest fuel cost. At 15,000 miles a year with $3.70/gal diesel fuel, it costs about $2,135 a year to fuel.

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Combined 26 MPG 23 MPG city · 30 MPG hwy

Driving range — not published for this model

Your fuel cost $2,135 15,000 mi/yr · $14.23 per 100 mi

Class rank, 2020 #6 of 16 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 2020 GMC Sierra Diesel's fuel average is 11.1 km/L (9.0 L/100 km), or 26 MPG combined: 9.8 km/L in the city and 12.8 km/L on the highway.

	MPG	km/L	L/100 km
City	23	9.8	10.2
Highway	30	12.8	7.8
Combined	26	11.1	9.0

How it ranks among 2020 Full-Size Pickups

Full class ranking →

1Ford Ranger23 MPG $2,022
2Ram 1500 Hybrid23 MPG $2,022
3Chevrolet Silverado Diesel27 MPG $2,056
4Ford F15022 MPG $2,114
5Honda Ridgeline22 MPG $2,114
6GMC Sierra Diesel26 MPG $2,135
···
16Roush Performance F15013 MPG $4,558

2020 Sierra DieselOther full-size pickupsClass median: $2,214/yr

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

Sierra Diesel MPG across model years

Full history →

2 EPA-rated configurations

Configuration	Type	City	Hwy	Combined	Range	Your cost / yr
RWD · 3.0L 6-cyl turbo · 10-speed automatic Sierra 2WD	Diesel	23 MPG	30 MPG	26 MPG	—	$2,135
4WD · 3.0L 6-cyl turbo · 10-speed automatic Sierra 4WD	Diesel	22 MPG	26 MPG	24 MPG	—	$2,312

Specs (most efficient configuration)

Fuel: Diesel
Engine / motor: 3.0L 6-cyl turbo
Transmission: 10-speed automatic
Drivetrain: RWD
Tailpipe CO₂: 392 g/mi
EPA fuel economy score: 5/10
EPA greenhouse gas score: 5/10

2020 GMC Sierra Diesel vs. rivals

vs Ram 1500 Diesel 26 MPG · $2,135/yr Same fuel cost vs Ford F150 22 MPG · $2,114/yr F150 saves $21/yr vs Honda Ridgeline 22 MPG · $2,114/yr Ridgeline saves $21/yr vs Chevrolet Silverado 21 MPG · $2,214/yr Sierra Diesel saves $80/yr vs Chevrolet Silverado Diesel 27 MPG · $2,056/yr Silverado Diesel saves $79/yr vs Ford Ranger 23 MPG · $2,022/yr Ranger saves $113/yr vs Ram 1500 Hybrid 23 MPG · $2,022/yr 1500 Hybrid saves $113/yr vs Ford F150 Diesel 24 MPG · $2,312/yr Sierra Diesel saves $178/yr vs Nissan Frontier 20 MPG · $2,325/yr Sierra Diesel saves $190/yr vs Ram 1500 20 MPG · $2,325/yr Sierra Diesel saves $190/yr vs Jeep Gladiator Pickup 19 MPG · $2,447/yr Sierra Diesel saves $313/yr vs GMC Sierra 21 MPG · $2,214/yr Sierra Diesel saves $80/yr

Compare the 2020 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: 2020 GMC Sierra (21 MPG)

Frequently asked questions

What is the gas mileage of the 2020 GMC Sierra Diesel?

Up to 26 MPG combined (23 city / 30 highway); ratings range from 24 to 26 MPG depending on configuration.

What fuel does the 2020 GMC Sierra Diesel use?

Diesel.

What is the fuel average in km/L for the 2020 GMC Sierra Diesel?