The SEAT Leon IV 1.5 eTSI (150 Hp) Mild Hybrid DSG, launched in 2020, represents the fourth generation of SEAT’s popular compact hatchback. Positioned within the competitive C-segment, the Leon IV aims to blend practicality, efficiency, and modern technology. While SEAT is not officially sold in the United States, the Leon is a significant model in the European market, competing with vehicles like the Volkswagen Golf, Ford Focus, and Opel Astra. The fourth generation marked a substantial evolution for the Leon, incorporating a new platform, updated styling, and a range of efficient powertrain options, including this mild-hybrid gasoline variant.
SEAT Leon IV 1.5 eTSI: A Detailed Overview
The Leon IV 1.5 eTSI utilizes a 48-volt mild hybrid system designed to improve fuel economy and reduce emissions. This system assists the gasoline engine during acceleration and allows for extended coasting with the engine off, contributing to a more efficient driving experience. The “eTSI” designation signifies SEAT’s implementation of this technology, which is a key component of their strategy to meet increasingly stringent emissions regulations. The model is exclusively offered with a seven-speed dual-clutch transmission (DSG), providing smooth and rapid gear changes.
Engine & Performance
At the heart of the SEAT Leon IV 1.5 eTSI is a 1.5-liter, inline-four cylinder turbocharged gasoline engine. This engine produces 150 horsepower at 5000-6000 rpm and 250 Nm (184.39 lb.-ft.) of torque between 1500-3500 rpm. The mild hybrid system adds a 48V starter-generator, enabling features like regenerative braking and extended engine-off coasting. This combination results in a 0-100 km/h (0-62 mph) acceleration time of 8.4 seconds and a top speed of 221 km/h (137.32 mph). The engine’s power-to-weight ratio is 8.6 kg/Hp, and its torque-to-weight ratio is 5.1 kg/Nm, contributing to a responsive driving feel. Fuel consumption, measured using the WLTP cycle, ranges from 5.6 to 6.4 liters per 100 kilometers (42 to 36.8 US mpg), with CO2 emissions between 127 and 144 g/km.
Design & Features
The SEAT Leon IV boasts a modern and dynamic exterior design. As a five-door hatchback, it offers a practical body style suitable for both urban and long-distance driving. The vehicle’s dimensions are 4368 mm (171.97 in) in length, 1800 mm (70.87 in) in width, and 1456 mm (57.32 in) in height, with a wheelbase of 2686 mm (105.75 in). Inside, the Leon IV features a driver-focused interior with a prominent central touchscreen infotainment system. Key features include a digital instrument cluster, advanced driver-assistance systems (ADAS) such as ABS, and a spacious cabin designed to comfortably accommodate five passengers. The trunk offers a minimum capacity of 380 liters (13.42 cu. ft.), expanding to 1301 liters (45.94 cu. ft.) with the rear seats folded down. The vehicle’s kerb weight is 1286 kg (2835.14 lbs), with a maximum permissible weight of 1890 kg (4166.74 lbs).
Technical Specifications
| Brand | Seat |
| Model | Leon |
| Generation | Leon IV |
| Type (Engine) | 1.5 eTSI (150 Hp) Mild Hybrid DSG |
| Start of production | 2020 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Hatchback |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 5.6-6.4 l/100 km (42 – 36.8 US mpg) |
| CO2 emissions (WLTP) | 127 – 144 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.4 sec |
| Acceleration 0 – 62 mph | 8.4 sec |
| Acceleration 0 – 60 mph | 8 sec |
| Maximum speed | 221 km/h (137.32 mph) |
| Emission standard | EURO 6 DG |
| Weight-to-power ratio | 8.6 kg/Hp |
| Weight-to-torque ratio | 5.1 kg/Nm |
| Power | 150 Hp @ 5000-6000 rpm |
| Torque | 250 Nm @ 1500-3500 rpm (184.39 lb.-ft.) |
| Engine layout | Front, Transverse |
| Engine Model/Code | DFYA |
| Engine displacement | 1498 cm3 (91.41 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 74.5 mm (2.93 in.) |
| Piston Stroke | 85.9 mm (3.38 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 4.3 l (4.54 US qt | 3.78 UK qt) |
| Coolant | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1286 kg (2835.14 lbs.) |
| Max. weight | 1890 kg (4166.74 lbs.) |
| Max load | 604 kg (1331.59 lbs.) |
| Trunk (boot) space – minimum | 380 l (13.42 cu. ft.) |
| Trunk (boot) space – maximum | 1301 l (45.94 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Length | 4368 mm (171.97 in.) |
| Width | 1800 mm (70.87 in.) |
| Height | 1456 mm (57.32 in.) |
| Wheelbase | 2686 mm (105.75 in.) |
| Front track | 1545 mm (60.83 in.) |
| Rear (Back) track | 1516 mm (59.69 in.) |
| Minimum turning circle | 10.5 m (34.45 ft.) |
| Drive wheel | Front wheel drive |
| Number of gears | 7 gears, automatic transmission DSG |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs, 288 mm |
| Rear brakes | Disc, 272 mm |
| Tires size | 195/65 R15 91H; 205/55 R16 91V; 225/45 R17 91W; 205/50R17 93V; 225/40 R18 92Y |
The SEAT Leon IV 1.5 eTSI Mild Hybrid DSG represents a compelling option in the compact hatchback segment, offering a balance of efficiency, performance, and modern features. Its mild-hybrid technology contributes to reduced emissions and improved fuel economy, making it a practical choice for everyday driving.
