2017 GMC Sierra C15 — Full Specifications
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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 C15 is a pickup powered by a 5.3L 8-cyl regular gasoline engine, returning around 23 mpg (UK) / 19.0 mpg (US EPA) combined. Owners often keep a GMC Sierra C15 workshop manual to hand for servicing and repairs.
Full Specifications
| Engine | 5.3L 8-cyl |
|---|---|
| Transmission | Automatic 6-spd |
| Fuel Type | Regular Gasoline |
| Drive | Rear-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) | 23 combined / 19 urban / 28 extra-urban mpg |
| Fuel Economy (US EPA) | 19.0 combined / 16.0 city / 23.0 highway mpg |
| CO₂ Emissions | 298 g/km |
Owner Essentials for the GMC Sierra C15
UK Running Costs
Insurance group not available — check with your insurer. At around 8,000 miles per year and 23 mpg combined, expect roughly 1581 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 C15 compare to similar pickups? Pickups in our database average around 22 mpg (UK) combined — this model sits close to that average, within 1 mpg. Its 298 g/km CO₂ figure is 14 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: · 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 C15 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 C15?
It returns around 23 mpg (UK) combined, or 19.0 mpg on the US EPA cycle.
Does the 2017 GMC Sierra C15 have a good safety rating?
NHTSA crash test data is not available for this model year.
How many seats does the 2017 GMC Sierra C15 have?
Seating capacity data is not available for this model year. It's classed as a pickup.
Is the GMC Sierra C15's fuel economy good for a pickup?
Yes — it returns around 23 mpg (UK) combined, against a same-body-style average of roughly 22 mpg among the pickups we track.