2025 Mercedes-Benz GLC300 — Full Specifications
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The 2025 Mercedes-Benz GLC300 is an SUV powered by a 2L 4-cyl turbo premium gasoline engine. Its most fuel-efficient configuration returns around 32 mpg (UK) / 27 mpg (US EPA) combined, with 31–32 mpg (UK) across all configurations. Owners often keep a Mercedes-Benz GLC300 workshop manual to hand for servicing and repairs.
Compared with the 2024 Mercedes-Benz GLC300: Fuel economy slips from 35 to 32 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) | 32 combined / 29 urban / 38 extra-urban mpg |
| Fuel Economy (US EPA) | 27 combined / 24 city / 32 highway mpg |
| CO₂ Emissions | 201 g/km |
| EPA Greenhouse Gas Score | 5 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,050 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2025 Mercedes-Benz GLC300, all with the 2L 4-cyl turbo engine. Combined fuel economy ranges from 26 to 27 mpg (US), or 31 to 32 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 | 32 | 27 (24/32) | 201 | $3,050 |
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 2025 Mercedes-Benz GLC300
Running Costs: 2025 Mercedes-Benz GLC300
Covering around 8,000 miles a year in a 2025 Mercedes-Benz GLC300 at 32 mpg combined, expect roughly 1,136 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,050 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.
2025 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 3 safety recall campaigns that include the 2025 Mercedes-Benz GLC300 (as of 6 October 2026). Most affected areas: Electrical system (1), Steering (1), Structure (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Electrical system — campaign 26V281000, reported 1 May 2026. Risk: An instrument panel display that fails to show critical safety information, such as the speedometer and warning lights, increases the risk of a crash.
- Steering — campaign 25V533000, reported 20 August 2025. Risk: A loose steering coupling can cause a loss of steering control, increasing the risk of a crash.
- Structure — campaign 25V379000, reported 6 June 2025. Risk: In the event of a crash, insufficient impact protection can increase the risk of injury.
Owners have filed 44 complaints with NHTSA about the 2025 Mercedes-Benz GLC300. The most-reported areas are Electrical system (26), Engine (6), Forward collision avoidance (6). Complaints include 4 reported crashes, 11 reported injuries. 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 2025 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 (1 recall campaign · 26 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Steering (1 recall campaign) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
- Body structure (1 recall campaign) — Inspect for corrosion and for subframe or body-panel damage, especially underneath.
- Engine (6 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
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 32 mpg figure is 5 mpg better than that average. Its 201 g/km CO₂ figure is 52 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 2025 Mercedes-Benz GLC300's 32 mpg is 6 mpg above that make average. Its 201 g/km CO₂ figure is 67 g/km lower than the 268 g/km Mercedes-Benz average.
Of the 11 Mercedes-Benz GLC300 model years we cover, the 2025 ranks 3rd for combined fuel economy on its best configuration (32 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 2025 Mercedes-Benz GLC300
Frequently Asked Questions
What engine does the 2025 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 2025 Mercedes-Benz GLC300?
The most efficient configuration returns around 32 mpg (UK) combined, or 27 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 31 to 32 mpg.
How much does the 2025 Mercedes-Benz GLC300 cost to fuel per year?
The US EPA estimates about $3,050 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 2025 Mercedes-Benz GLC300 have any recalls?
NHTSA lists 3 safety recall campaigns that include the 2025 Mercedes-Benz GLC300 (as of 6 October 2026). Most affected areas: Electrical system (1), Steering (1), Structure (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
What are the most common problems reported for the 2025 Mercedes-Benz GLC300?
Among the 44 owner complaints filed with NHTSA, the most-reported areas are Electrical system (26 complaints), Engine (6 complaints), Forward collision avoidance (6 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 32 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.