Turbochargers represented 44.4% of U.S. gasoline-engine production in model year 2024, up from 1.2% in 2000. The adoption trend coincided with smaller average engines, higher horsepower, and continued experimentation with efficiency and electric assistance. These turbocharger statistics cover U.S. production, historical EPA projections, technical targets, and selected engineering tests.
Contents
- U.S. gasoline turbocharger adoption
- Turbocharging and engine downsizing
- Turbochargers across 2024 powertrains
- Historical EPA benchmarks
- Efficiency and fuel-economy measurements
- Experimental turbocharger performance
U.S. gasoline turbocharger adoption
The long-run U.S. production series shows turbocharging moving from a very small share of gasoline engines to a mainstream technology. Turbocharged gasoline engines accounted for 1.2% of production in model year 2000 and 1.4% in 2005. The share reached 2.6% in 2010, then rose to 6.1% in 2011 and 7.5% in 2012.
Growth accelerated in the following years. Turbocharged gasoline engines represented 13.0% of production in 2013, 13.8% in 2014, 14.8% in 2015, and 19.4% in 2016. The share was 23.2% in 2017, 29.6% in 2018, and 29.8% in 2019.
The later years in the series were higher still: 34.2% in 2020, 31.8% in 2021, 35.8% in 2022, and 37.3% in 2023. Turbocharged gasoline engines reached 44.4% in model year 2024. Preliminary model-year 2025 data put the share at 44.8%; that figure is explicitly preliminary, so it should not be treated as a final production result. These figures come from The 2025 EPA Automotive Trends Report.
| Model year | Turbocharged gasoline-engine share |
|---|---|
| 2000 | 1.2% |
| 2010 | 2.6% |
| 2015 | 14.8% |
| 2020 | 34.2% |
| 2024 | 44.4% |
| 2025 preliminary | 44.8% |
The series is a production share, not a measure of every vehicle currently on the road. It also describes gasoline-engine production in this section, so it should not be confused with the share of all vehicles or with aftermarket turbocharger installations.
The year-to-year pattern is not perfectly monotonic. For example, the share rose from 29.8% in 2019 to 34.2% in 2020, fell to 31.8% in 2021, and then climbed to 35.8% in 2022. That movement matters when interpreting adoption: a single model year can differ from the broader direction of the series. The 2024 value is therefore best understood alongside the earlier observations, while the 2025 value remains a preliminary estimate rather than a completed endpoint.
Turbocharging and engine downsizing
The same U.S. production data pairs rising turbocharger penetration with a lower average cylinder count and displacement. In model year 2000, gasoline engines averaged 5.7 cylinders, 200 cubic inches of displacement, and 181 horsepower, while turbocharger penetration was 1.2%.
By 2005, the averages were 5.8 cylinders, 205 cubic inches, and 209 horsepower, with 1.4% turbocharger penetration. In 2010, the averages were 5.3 cylinders, 188 cubic inches, and 214 horsepower, alongside 2.6% penetration. In 2015, gasoline engines averaged 5.0 cylinders, 177 cubic inches, and 229 horsepower; turbochargers represented 14.8% of production.
The 2020 averages were 4.9 cylinders, 169 cubic inches, and 243 horsepower, with 34.2% turbocharger penetration. By 2024, the averages were 4.7 cylinders, 159 cubic inches, and 247 horsepower, while penetration reached 44.4%.
| Model year | Average cylinders | Average displacement | Average horsepower | Turbocharger penetration |
|---|---|---|---|---|
| 2000 | 5.7 | 200 cu. in. | 181 hp | 1.2% |
| 2005 | 5.8 | 205 cu. in. | 209 hp | 1.4% |
| 2010 | 5.3 | 188 cu. in. | 214 hp | 2.6% |
| 2015 | 5.0 | 177 cu. in. | 229 hp | 14.8% |
| 2020 | 4.9 | 169 cu. in. | 243 hp | 34.2% |
| 2024 | 4.7 | 159 cu. in. | 247 hp | 44.4% |
These measurements show the direction of the fleet averages, but they do not establish that turbocharging alone caused every change. Vehicle mix, engine design, transmission technology, and other powertrain features also vary across model years. The reported production metrics and penetration figures are from The 2025 EPA Automotive Trends Report.
Turbochargers across 2024 powertrains
Turbocharger use varied substantially by powertrain category in the 2024 U.S. production dataset. All diesel vehicles in that dataset were turbocharged, although diesel vehicles made up only 0.7% of total production. Among gasoline internal-combustion vehicles without stop/start, turbochargers appeared in 20.6%. The share was 57.1% for gasoline internal-combustion vehicles with stop/start.
Turbochargers appeared in 75.3% of mild-hybrid vehicles, 23.3% of strong-hybrid vehicles, and 67.7% of plug-in hybrid vehicles. Across all vehicles in the dataset, the turbocharger share was 45.1%.
The 2024 gasoline internal-combustion category with stop/start combined 57.1% turbocharger penetration with average fuel economy of 24.3 miles per gallon. That pairing describes the category average; it is not a fuel-economy value for every turbocharged vehicle.
Historical EPA benchmarks
Earlier EPA reports provide useful snapshots of how turbocharging was expected to spread. A preliminary model-year-2016 projection put turbocharged engines at approximately 22% of new U.S. vehicle production. Excluding diesel engines, 76% of turbocharged engines were combined with four-cylinder engines, while about 19% were combined with six-cylinder engines. More than 60% of turbocharged engines were projected to be installed in four-cylinder cars.
The same model-year-2016 projection said more than 90% of new vehicles with gasoline turbocharged engines also used gasoline direct injection. These values are historical projections and should be read as such, rather than as independently verified final results. The source is the EPA’s Light-Duty Automotive Technology, Carbon Dioxide Emissions, and Fuel Economy Trends: 1975 Through 2016.
The EPA’s 2020 automotive trends report stated that turbocharged engines accounted for 30% of all U.S. vehicle production in model year 2019 and projected 35% for model year 2020. It also reported that about 80% of gasoline turbocharged engines were four-cylinder engines in 2019, while almost 90% of new vehicles with gasoline turbocharged engines also used gasoline direct injection. The 2020 figure is a projection, not a final measurement. These historical benchmarks are from The 2020 EPA Automotive Trends Report.
Efficiency and fuel-economy measurements
Technical targets provide a different view from fleet adoption. A U.S. Department of Energy technical report gave current-practice turbocharger efficiency as 50% to 58% for its engine-efficiency baseline. The report set a 72% to 76% turbocharger-efficiency target using variable geometry or a similar enhancement. It also identified recovery of an additional 12% of exhaust energy as a technical target for exhaust-heat recovery. These are report baselines and technical targets, not a claim that every production turbocharger reaches the target. See Summary of engine-efficiency parameters, technical targets, and barriers.
Vehicle and engine studies supplied additional measurements. A production-vehicle analysis based on 10 years of data found that gasoline turbocharging enabled about 30% engine downsizing at the same power. The analysis reported an 8% to 10% fuel-economy improvement from gasoline turbocharging at the same power. In the same vehicle and at the same power and performance, experimental downsized turbocharged gasoline engines delivered about 18% better fuel economy. Those results belong to the 2004 study conditions and comparisons described in Advanced Gasoline Engine Turbocharging Technology for Fuel Economy Improvements; they are not universal guarantees for later vehicles.
Experimental turbocharger performance
Experimental work also measures individual turbocharger components and electrically assisted systems. In a 2013 electrically assisted turbocharger test, peak radial-turbine efficiency reached 69% at a velocity ratio of 0.65 and 60% vane opening. The motor-generator exceeded 90% peak efficiency at 120,000 revolutions per minute.
In motoring mode, the motor-generator produced a maximum shaft power of 3.5 kilowatts. In generating mode, it produced a maximum shaft power of 5.4 kilowatts. These are test measurements for the configuration and operating conditions reported in Experimental Efficiency Characterization of an Electrically Assisted Turbocharger, not fleet-wide performance averages.
A separate 2022 modeling study analyzed a 1.8-liter turbocharged direct-injection gasoline engine with thermal efficiency improved up to 45%. Because this is a modeling result, “up to 45%” identifies the reported upper result under the study’s modeled conditions rather than a measured efficiency for all 1.8-liter turbocharged engines. The study is Modeling Analysis of Thermal Efficiency Improvement up to 45% of a Turbocharged Gasoline Engine.