2023 Mercedes-Benz GLC300 — Full Specifications
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The 2023 Mercedes-Benz GLC300 is an SUV powered by a 2L 4-cyl turbo premium gasoline engine. Its most fuel-efficient configuration returns around 34 mpg (UK) / 28 mpg (US EPA) combined, with 31–34 mpg (UK) across all configurations. Owners often keep a Mercedes-Benz GLC300 workshop manual to hand for servicing and repairs.
Compared with the 2022 Mercedes-Benz GLC300: Fuel economy improves from 29 to 34 mpg (UK) combined on the most efficient configuration. The engine line-up listed by EPA is unchanged.
Full Specifications
| Engine | 2L 4-cyl turbo |
|---|---|
| Transmission | Automatic 9-spd |
| Fuel Type | Premium Gasoline |
| Powertrain | Hybrid |
| Drive | Rear-Wheel Drive |
| Body Style | SUV |
| Fuel Economy (UK) | 34 combined / 30 urban / 38 extra-urban mpg |
| Fuel Economy (US EPA) | 28 combined / 25 city / 32 highway mpg |
| CO₂ Emissions | 196 g/km |
| EPA Greenhouse Gas Score | 6 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $2,950 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2023 Mercedes-Benz GLC300, all with the 2L 4-cyl turbo engine. Combined fuel economy ranges from 26 to 28 mpg (US), or 31 to 34 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 2L 4-cyl turbo (Hybrid) | Automatic 9-spd | All-Wheel Drive | 31 | 26 (23/31) | 210 | $3,150 |
| 2L 4-cyl turbo (Hybrid) | Automatic 9-spd | Rear-Wheel Drive | 34 | 28 (25/32) | 196 | $2,950 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
Owner Essentials for the 2023 Mercedes-Benz GLC300
Running Costs: 2023 Mercedes-Benz GLC300
Covering around 8,000 miles a year in a 2023 Mercedes-Benz GLC300 at 34 mpg combined, expect roughly 1,070 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $2,950 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Planning a road trip? Grab a road trip packing list. Only need this car occasionally? See our buy vs rent comparison.
2023 Mercedes-Benz GLC300 Safety Ratings (NHTSA)
No NHTSA crash-test rating is on record for this model year. The NHTSA rates only a subset of vehicles each year; you can browse every rated vehicle on our NHTSA Safety Ratings hub.
Recalls & Owner Complaints (NHTSA)
NHTSA lists no safety recall campaigns for the 2023 Mercedes-Benz GLC300 as of 6 October 2026. Recalls can be issued years after a model is sold, so it is still worth checking your own VIN.
Owners have filed 65 complaints with NHTSA about the 2023 Mercedes-Benz GLC300. The most-reported areas are Electrical system (30), Engine (15), Unspecified (12). Complaints include 2 reported crashes, 4 reported injuries, 1 reported death. That is close to the median of 66 complaints across the 11 Mercedes-Benz GLC300 model years in our data.
Used-buyer checklist for the 2023 Mercedes-Benz GLC300
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Electrical system (30 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Engine (15 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
- Lighting (10 owner complaints) — Check every exterior light works and look for moisture inside the lamp housings.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
How does the Mercedes-Benz GLC300 compare to similar SUVs? For context, SUVs in our database average around 27 mpg (UK) combined — this model's 34 mpg figure is 7 mpg better than that average. Its 196 g/km CO₂ figure is 57 g/km lower than the 253 g/km average for SUVs on this site. This comparison is based on 1824 SUVs in our dataset.
Mercedes-Benz models in our database average about 26 mpg (UK) combined on their most efficient configuration; the 2023 Mercedes-Benz GLC300's 34 mpg is 8 mpg above that make average. Its 196 g/km CO₂ figure is 72 g/km lower than the 268 g/km Mercedes-Benz average.
Of the 11 Mercedes-Benz GLC300 model years we cover, the 2023 ranks 2nd for combined fuel economy on its best configuration (34 mpg UK combined, against a high of 35 mpg). See every Mercedes-Benz GLC300 year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 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.
Recommended Accessories for the 2023 Mercedes-Benz GLC300
Frequently Asked Questions
What engine does the 2023 Mercedes-Benz GLC300 have?
It's fitted with a 2L 4-cyl turbo premium gasoline engine, paired with a automatic 9-spd transmission.
What is the fuel economy of the 2023 Mercedes-Benz GLC300?
The most efficient configuration returns around 34 mpg (UK) combined, or 28 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 31 to 34 mpg.
How much does the 2023 Mercedes-Benz GLC300 cost to fuel per year?
The US EPA estimates about $2,950 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2023 Mercedes-Benz GLC300 have any recalls?
NHTSA lists no safety recall campaigns for the 2023 Mercedes-Benz GLC300 as of 6 October 2026. Recalls can be issued years after a model is sold, so it is still worth checking your own VIN.
What are the most common problems reported for the 2023 Mercedes-Benz GLC300?
Among the 65 owner complaints filed with NHTSA, the most-reported areas are Electrical system (30 complaints), Engine (15 complaints), Unspecified (12 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
Is the Mercedes-Benz GLC300's fuel economy good for an SUV?
Yes — it returns around 34 mpg (UK) combined, against a same-body-style average of roughly 27 mpg among the SUVs we track, making it one of the more efficient options in its class.