2008 · Full-Size Pickup · Gas / Flex-fuel

2008 GMC Sierra MPG & fuel economy

The 2008 GMC Sierra is a full-size pickup offered in 12 EPA-rated configurations. The most efficient version returns 17 MPG combined (15 city / 20 highway) on regular gasoline. Across the lineup, combined ratings range from 14 to 17 MPG. Efficiency is unchanged from the 2007 model. Among 15 full-size pickups rated for 2008, it ranks 3rd for lowest fuel cost. At 15,000 miles a year with $3.10/gal regular gas, it costs about $2,735 a year to fuel.

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Combined 17 MPG 15 MPG city · 20 MPG hwy

Driving range — not published for this model

Your fuel cost $2,735 15,000 mi/yr · $18.24 per 100 mi

Class rank, 2008 #3 of 15 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 Regular gas $/gal Premium gas $/gal

Fuel average

The 2008 GMC Sierra's fuel average is 7.2 km/L (13.8 L/100 km), or 17 MPG combined: 6.4 km/L in the city and 8.5 km/L on the highway.

	MPG	km/L	L/100 km
City	15	6.4	15.7
Highway	20	8.5	11.8
Combined	17	7.2	13.8

How it ranks among 2008 Full-Size Pickups

Full class ranking →

1Dodge Dakota Pickup18 MPG $2,583
2Mitsubishi Raider Pickup18 MPG $2,583
3GMC Sierra17 MPG $2,735
4Dodge Ram 1500 Pickup17 MPG $2,735
5Chevrolet Silverado17 MPG $2,735
···
15Saleen S331 Family13 MPG $4,558

2008 SierraOther full-size pickupsClass median: $2,906/yr

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

Sierra MPG across model years

Full history →

12 EPA-rated configurations

Configuration	Type	City	Hwy	Combined	Range	Your cost / yr
RWD · 4.3L 6-cyl · 4-speed automatic Sierra C15 2WD	Gas	15 MPG	20 MPG	17 MPG	—	$2,735
RWD · 5.3L 8-cyl · 4-speed automatic Sierra C15 2WD	Gas	15 MPG	20 MPG	17 MPG	—	$2,735
RWD · 5.3L 8-cyl · 4-speed automatic Sierra C15 2WD	Flex-fuel	15 MPG	20 MPG	17 MPG	—	$2,735
RWD · 4.8L 8-cyl · 4-speed automatic Sierra C15 2WD	Gas	14 MPG	19 MPG	16 MPG	—	$2,906
4WD/AWD · 4.8L 8-cyl · 4-speed automatic Sierra K15 4WD	Gas	14 MPG	18 MPG	16 MPG	—	$2,906
4WD/AWD · 5.3L 8-cyl · 4-speed automatic Sierra K15 4WD	Gas	14 MPG	19 MPG	16 MPG	—	$2,906
4WD/AWD · 5.3L 8-cyl · 4-speed automatic Sierra K15 4WD	Flex-fuel	14 MPG	19 MPG	16 MPG	—	$2,906
RWD · 6.0L 8-cyl · 4-speed automatic Sierra C15 2WD	Gas	13 MPG	18 MPG	15 MPG	—	$3,100
4WD/AWD · 4.3L 6-cyl · 4-speed automatic Sierra K15 4WD	Gas	14 MPG	18 MPG	15 MPG	—	$3,100
4WD/AWD · 6.0L 8-cyl · 4-speed automatic Sierra K15 4WD	Gas	13 MPG	17 MPG	14 MPG	—	$3,321
RWD · 6.2L 8-cyl · 6-speed automatic Sierra C15 2WD	Gas	12 MPG	19 MPG	15 MPG	—	$3,950
4WD/AWD · 6.2L 8-cyl · 6-speed automatic Sierra K15 AWD	Gas	12 MPG	18 MPG	14 MPG	—	$4,232

Specs (most efficient configuration)

Fuel: Regular gasoline
Engine / motor: 4.3L 6-cyl
Transmission: 4-speed automatic
Drivetrain: RWD
Tailpipe CO₂: 523 g/mi

2008 GMC Sierra vs. rivals

vs Dodge Ram 1500 Pickup 17 MPG · $2,735/yr Same fuel cost vs Chevrolet Silverado 17 MPG · $2,735/yr Same fuel cost vs Toyota Tundra 17 MPG · $2,735/yr Same fuel cost vs Honda Ridgeline 17 MPG · $2,735/yr Same fuel cost vs Dodge Dakota Pickup 18 MPG · $2,583/yr Dakota Pickup saves $152/yr vs Mitsubishi Raider Pickup 18 MPG · $2,583/yr Raider Pickup saves $152/yr vs Ford F150 16 MPG · $2,906/yr Sierra saves $171/yr vs Ford Explorer 16 MPG · $2,906/yr Sierra saves $171/yr vs Nissan Titan 14 MPG · $3,321/yr Sierra saves $586/yr vs Roush Performance F150 13 MPG · $4,558/yr Sierra saves $1,822/yr vs Tecstar, LP Foose F150 13 MPG · $4,558/yr Sierra saves $1,822/yr vs Lincoln Mark LT 14 MPG · $3,321/yr Sierra saves $586/yr

Compare the 2008 Sierra

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Frequently asked questions

What is the gas mileage of the 2008 GMC Sierra?

Up to 17 MPG combined (15 city / 20 highway); ratings range from 14 to 17 MPG depending on configuration.

What fuel does the 2008 GMC Sierra use?

Regular gasoline.

What is the fuel average in km/L for the 2008 GMC Sierra?