2017 GMC Sierra K15 — Full Specifications

Reviewed by the 247VehicleCheck Data Team — automotive data reviewers

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22Combined MPG (UK)

5.3L 8-cylEngine

Regular GasolineFuel Type

N/AInsurance Group UK

N/ANHTSA Safety

307CO₂ g/km

Running gear matters most — before anything else, UK: check tyre prices at TirendoUS: check wheel & tyre prices at WheelHero for this car's fitment.

The 2017 GMC Sierra K15 is a pickup powered by a 5.3L 8-cyl regular gasoline engine, returning around 22 mpg (UK) / 18.0 mpg (US EPA) combined. Owners often keep a GMC Sierra K15 workshop manual to hand for servicing and repairs.

Full Specifications

Engine	5.3L 8-cyl
Transmission	Automatic 6-spd
Fuel Type	Regular Gasoline
Drive	4-Wheel Drive
Body Style	Pickup
Seats	Data not available
Length	Data not available
Width	Data not available
Height	Data not available
Kerb Weight	Data not available
Fuel Economy (UK)	22 combined / 19 urban / 26 extra-urban mpg
Fuel Economy (US EPA)	18.0 combined / 16.0 city / 22.0 highway mpg
CO₂ Emissions	307 g/km

Owner Essentials for the GMC Sierra K15

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UK Running Costs

Insurance group not available — check with your insurer. At around 8,000 miles per year and 22 mpg combined, expect roughly 1653 litres of fuel annually — multiply by your local price per litre for a cost estimate. Work out exact fuel costs with the fuel cost calculator on 247Calculators. Keeping the car well maintained helps too — a decent car care kit protects resale value.

Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.

Only need this car occasionally? See our buy vs rent comparison.

Safety Ratings (NHTSA)

NHTSA crash test data not available for this model year.

How It Compares

How does the GMC Sierra K15 compare to similar pickups? Pickups in our database average around 22 mpg (UK) combined — this model sits close to that average, within 0 mpg. Its 307 g/km CO₂ figure is 5 g/km lower than the 312 g/km average for pickups on this site. This comparison is based on 187 pickups in our dataset.

Last updated: 12 September 2026 · Data: US EPA (fueleconomy.gov) & NHTSA snapshots 18 July 2026; Wikidata & curated EU catalogue 18 July 2026

Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.

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Frequently Asked Questions

What engine does the 2017 GMC Sierra K15 have?

It's fitted with a 5.3L 8-cyl regular gasoline engine, paired with a automatic 6-spd transmission.

What is the fuel economy of the 2017 GMC Sierra K15?

It returns around 22 mpg (UK) combined, or 18.0 mpg on the US EPA cycle.

Does the 2017 GMC Sierra K15 have a good safety rating?

NHTSA crash test data is not available for this model year.

How many seats does the 2017 GMC Sierra K15 have?

Seating capacity data is not available for this model year. It's classed as a pickup.

Is the GMC Sierra K15's fuel economy good for a pickup?

It returns around 22 mpg (UK) combined, against a same-body-style average of roughly 22 mpg among the pickups we track.