Meet BYD's 1.5 Engine That Achieves an Impressive 44.2 Km/L and Is Changing the Concept of Fuel Economy in Hybrid Cars in Brazil

Meet BYD’s 1.5 Engine That Achieves an Impressive 44.2 Km/L and Is Changing the Concept of Fuel Economy in Hybrid Cars in Brazil

Written by Noel Budeguer

Published on 09/08/2025 at 11:19

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Meet the 1.5 Engine from BYD, With Atkinson Cycle and DM-i Hybrid Technology, Combining Advanced Thermal Efficiency and Electric Motor to Achieve 44.2 km/l.

In the world of hybrid vehicles, BYD’s 1.5 DM-i engine stands out for its innovative technology and incredible energy efficiency. This Atkinson cycle engine is the heart of many of the brand’s hybrid models, such as the Song Pro DM-i, the Song Plus DM-i, and the King DM-i, all available in Brazil. The 1.5 DM-i is not just a conventional internal combustion engine, but a key piece of BYD’s strategy to transform the automotive industry towards a cleaner and more efficient future.

What Is the Atkinson Cycle?

The Atkinson cycle is a type of thermodynamic cycle mainly used in hybrid and high-efficiency engines. This cycle differs from the traditional Otto cycle, which is the most commonly used in most gasoline engines. The main difference between the two lies in how the engine manages the air-fuel mixture during the combustion process.

In an Otto cycle engine, the compression ratio is higher, which improves power but can also increase emissions and fuel consumption. The Atkinson engine sacrifices some power to achieve greater thermal efficiency by extending the expansion time. This allows it to extract more energy from each drop of fuel, resulting in better efficiency and lower CO₂ emissions.

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Technical Details of the 1.5 DM-i Engine

The BYD 1.5 DM-i engine, in its plug-in hybrid version, delivers 98 hp in the combustion engine, and when combined with the electric motor and battery, achieves total powers that vary by model: from 209 hp in the King DM-i to 235 hp in the Song Plus DM-i.

The integration between the combustion engine and the electric one allows for long stretches of driving in fully electric mode, activating the combustion engine only when necessary to extend the range or provide more power.

Efficiency and Consumption: Official Data from BYD Brazil

The consumption and range figures published by BYD in Brazil represent the equivalent consumption — a calculation that considers the combined use of electricity and fuel.
According to the manufacturer:

Song Pro DM-i
- Equivalent consumption: 40.6 km/l
- Combined range: 1,100 km
- Electric range: up to 71 km
Song Plus DM-i
- Equivalent consumption: 38.8 km/l
- Combined range: 1,050 km
- Electric range: up to 105 km
King DM-i
- Equivalent consumption: 44.2 km/l
- Combined range: 1,200 km
- Electric range: up to 55 km
- Urban consumption only on the combustion engine: 16.8 km/l

It is worth noting that these values correspond to ideal conditions of hybrid use, starting with a charged battery and making the most of the electric motor. Real consumption only on the combustion engine will be higher, depending on the type of route and driving style.

With a combined range of 1,050 km and up to 105 km in 100% electric mode, the BYD Song Plus DM-i achieves an official equivalent consumption of 38.8 km/l in Brazil, combining performance and energy efficiency

Is the 1.5 DM-i Engine Flex?

Yes. BYD has confirmed that some of its models sold in Brazil, such as the Song Pro DM-i, are being adapted to operate as Flex, running on both gasoline and ethanol — a renewable fuel widely used in the country. This configuration increases user flexibility, extends range, and contributes to reducing CO₂ emissions.

The hybrid 1.5 DM-i Flex engine maintains the same efficiency proposal as the gasoline versions, but with the advantage of utilizing cleaner and renewable origin fuels.

Meet BYD’s 1.5 Engine That Achieves an Impressive 44.2 Km/L and Is Changing the Concept of Fuel Economy in Hybrid Cars in Brazil