2015 Lexus IS 350 — Full Specifications
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The 2015 Lexus IS 350 is a saloon/sedan powered by a 3.5L 6-cyl premium gasoline engine. Its most fuel-efficient configuration returns around 26 mpg (UK) / 22 mpg (US EPA) combined, with 25–26 mpg (UK) across all configurations. Owners often keep a Lexus IS 350 workshop manual to hand for servicing and repairs.
Compared with the 2014 Lexus IS 350: Fuel economy is essentially unchanged at around 26 mpg (UK) combined. The engine line-up listed by EPA is unchanged. It carries the same 5★ overall NHTSA rating.
Full Specifications
| Engine | 3.5L 6-cyl |
|---|---|
| Transmission | Automatic (S8) |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | Rear-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 90 cu ft (2,549 L) |
| Luggage Volume (EPA) | 11 cu ft (311 L) |
| Fuel Economy (UK) | 26 combined / 23 urban / 34 extra-urban mpg |
| Fuel Economy (US EPA) | 22 combined / 19 city / 28 highway mpg |
| CO₂ Emissions | 249 g/km |
| EPA Greenhouse Gas Score | 5 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $3,750 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2015 Lexus IS 350, all with the 3.5L 6-cyl engine. Combined fuel economy ranges from 21 to 22 mpg (US), or 25 to 26 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 |
|---|---|---|---|---|---|---|
| 3.5L 6-cyl | Automatic (S6) | All-Wheel Drive | 25 | 21 (19/26) | 257 | $3,900 |
| 3.5L 6-cyl | Automatic (S8) | Rear-Wheel Drive | 26 | 22 (19/28) | 249 | $3,750 |
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 90 cubic feet (about 2,549 litres) and luggage volume at 11 cubic feet (about 311 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2015 Lexus IS 350
Running Costs: 2015 Lexus IS 350
Covering around 8,000 miles a year in a 2015 Lexus IS 350 at 26 mpg combined, expect roughly 1,399 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $3,750 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.
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2015 Lexus IS 350 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists no safety recall campaigns for the 2015 Lexus IS 350 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 13 complaints with NHTSA about the 2015 Lexus IS 350. The most-reported areas are Electrical system (4), Fuel/propulsion system (2), Steering (2).
Used-buyer checklist for the 2015 Lexus IS 350
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Electrical system (4 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Fuel system (2 owner complaints) — Ask whether any fuel-pump or fuel-system recalls were completed, and watch for hard starting or stalling.
- Steering (2 owner complaints) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
- Lighting (1 owner complaint) — 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
Lexus models in our database average about 28 mpg (UK) combined on their most efficient configuration; the 2015 Lexus IS 350's 26 mpg is 2 mpg below that make average.
Of the 16 Lexus IS 350 model years we cover, the 2015 ranks 9th for combined fuel economy on its best configuration (26 mpg UK combined, against a high of 28 mpg). See every Lexus IS 350 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 2015 Lexus IS 350
Frequently Asked Questions
What engine does the 2015 Lexus IS 350 have?
It's fitted with a 3.5L 6-cyl premium gasoline engine, paired with a automatic (s8) transmission.
What is the fuel economy of the 2015 Lexus IS 350?
The most efficient configuration returns around 26 mpg (UK) combined, or 22 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 25 to 26 mpg.
How much does the 2015 Lexus IS 350 cost to fuel per year?
The US EPA estimates about $3,750 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 2015 Lexus IS 350 have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 4 stars for frontal crash protection.
Does the 2015 Lexus IS 350 have any recalls?
NHTSA lists no safety recall campaigns for the 2015 Lexus IS 350 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 2015 Lexus IS 350?
Among the 13 owner complaints filed with NHTSA, the most-reported areas are Electrical system (4 complaints), Fuel/propulsion system (2 complaints), Steering (2 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 2015 Lexus IS 350 have?
EPA measures interior passenger volume at 90 cubic feet (about 2,549 litres) and luggage volume at 11 cubic feet (about 311 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.