2018 Chevrolet Impala — Full Specifications
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The 2018 Chevrolet Impala is a saloon/sedan offered with 2 engines (2.5L 4-cyl, 3.6L 6-cyl). Its most fuel-efficient configuration returns around 30 mpg (UK) / 25 mpg (US EPA) combined, with 26–30 mpg (UK) across all configurations. Owners often keep a Chevrolet Impala workshop manual to hand for servicing and repairs.
Compared with the 2017 Chevrolet Impala: Fuel economy is essentially unchanged at around 30 mpg (UK) combined. The engine line-up listed by EPA is unchanged. It carries the same 5★ overall NHTSA rating.
Full Specifications
| Engine (most efficient) | 2.5L 4-cyl |
|---|---|
| Engine options | 2.5L 4-cyl · 3.6L 6-cyl |
| Transmission (most efficient) | Automatic (S6) |
| Fuel Type | Regular Gasoline |
| Powertrain | Conventional |
| Drive | Front-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 105 cu ft (2,973 L) |
| Luggage Volume (EPA) | 19 cu ft (538 L) |
| Fuel Economy (UK) | 30 combined / 26 urban / 36 extra-urban mpg |
| Fuel Economy (US EPA) | 25 combined / 22 city / 30 highway mpg |
| CO₂ Emissions | 224 g/km |
| EPA Greenhouse Gas Score | 4 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $2,700 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 3 configurations for the 2018 Chevrolet Impala across 2 engines (2.5L 4-cyl, 3.6L 6-cyl). Combined fuel economy ranges from 22 to 25 mpg (US), or 26 to 30 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 |
|---|---|---|---|---|---|---|
| 2.5L 4-cyl | Automatic (S6) | Front-Wheel Drive | 30 | 25 (22/30) | 224 | $2,700 |
| 3.6L 6-cyl | Automatic (S6) | Front-Wheel Drive | 26 | 22 (18/28) | 254 | $3,050 |
| 3.6L 6-cyl | Automatic (S6) | Front-Wheel Drive | 26 | 22 (19/28) | 251 | $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.
EPA measures interior passenger volume at 105 cubic feet (about 2,973 litres) and luggage volume at 19 cubic feet (about 538 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2018 Chevrolet Impala
Running Costs: 2018 Chevrolet Impala
Covering around 8,000 miles a year in a 2018 Chevrolet Impala at 30 mpg combined, expect roughly 1,212 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $2,700 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.
Only need this car occasionally? See our buy vs rent comparison.
2018 Chevrolet Impala Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 1 safety recall campaign that include the 2018 Chevrolet Impala (as of 6 October 2026). Most affected areas: Service brakes (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Service brakes — campaign 18V576000, reported 30 August 2018. Risk: A reduction of braking performance can increase the risk of a crash.
Owners have filed 59 complaints with NHTSA about the 2018 Chevrolet Impala. The most-reported areas are Unspecified (16), Power train (11), Electrical system (11). Complaints include 6 reported crashes, 2 reported injuries. That is well below the median of 272 complaints across the 11 Chevrolet Impala model years in our data.
Used-buyer checklist for the 2018 Chevrolet Impala
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Transmission & drivetrain (11 owner complaints) — On the test drive, watch for hesitation, jerking or slipping between gears and ask for transmission service history.
- Electrical system (11 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Brakes (1 recall campaign) — Brake firmly from speed and look for pulling, vibration or a soft pedal; ask for brake service history.
- Steering (7 owner complaints) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
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
At 30 mpg (UK) combined it sits close to the 29 mpg average for Chevrolet models in our database. Its 224 g/km CO₂ figure is 22 g/km lower than the 246 g/km Chevrolet average.
Of the 11 Chevrolet Impala model years we cover, the 2018 is the most economical on its best configuration (30 mpg UK combined). See every Chevrolet Impala 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 2018 Chevrolet Impala
Frequently Asked Questions
What engine does the 2018 Chevrolet Impala have?
EPA lists 2 engines for the 2018 Chevrolet Impala: 2.5L 4-cyl, 3.6L 6-cyl. The most fuel-efficient configuration pairs the 2.5L 4-cyl with a automatic (s6).
What is the fuel economy of the 2018 Chevrolet Impala?
The most efficient configuration returns around 30 mpg (UK) combined, or 25 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 26 to 30 mpg.
How much does the 2018 Chevrolet Impala cost to fuel per year?
The US EPA estimates about $2,700 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 2018 Chevrolet Impala have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 5 stars for frontal crash protection.
Does the 2018 Chevrolet Impala have any recalls?
NHTSA lists 1 safety recall campaign that include the 2018 Chevrolet Impala (as of 6 October 2026). Most affected areas: Service brakes (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 2018 Chevrolet Impala?
Among the 59 owner complaints filed with NHTSA, the most-reported areas are Unspecified (16 complaints), Power train (11 complaints), Electrical system (11 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
How much interior and luggage space does the 2018 Chevrolet Impala have?
EPA measures interior passenger volume at 105 cubic feet (about 2,973 litres) and luggage volume at 19 cubic feet (about 538 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.