
Taking the Song Plus New Energy 2021 DM-i 51km Premium model as an example, this model has a fuel consumption of 1.5 liters. Its dimensions are 4705 mm in length, 1890 mm in width, and 1680 mm in height, with a wheelbase of 2765 mm. The fuel tank capacity is 60 liters, and the body structure is a 5-door, 5-seat SUV with front-wheel drive. In terms of power, it is equipped with a 1.5-liter naturally aspirated engine, delivering a maximum power of 81 kW and a maximum torque of 135 Nm. For the suspension, this vehicle features a MacPherson strut independent suspension at the front and a multi-link independent suspension at the rear.

As a city commuter driving the Song Plus DMi daily, I pay the most attention to fuel consumption data. This car basically doesn't consume any fuel in pure electric mode, but when driving long distances without charging, the actual fuel consumption is around 5L/100km. I specifically tested it twice with a full tank under mixed road conditions - it reached up to 5.5L in city traffic jams, and dropped to as low as 4.3L when maintaining 100 km/h on highways. Compared to my previous fuel-powered car, it saves me over 300 yuan in fuel costs monthly. However, fuel consumption increases noticeably when using the heater in winter or frequently accelerating hard. Recently, I saw someone in the car owners' group achieving 4.8L - the key is to make good use of the kinetic energy recovery mode, and maintaining tire pressure at 2.5Bar is also crucial as insufficient pressure increases fuel consumption.

Driving the Song Plus DM-i with family on a self-driving trip really highlights its fuel efficiency advantage. Last week, I made a round trip from Beijing to Beidaihe covering about 700 kilometers, deliberately testing the fuel consumption in battery-depletion mode without charging. The dashboard showed 5.1L/100km at a constant 120km/h highway speed, and about 5.6L/100km on more complex national road conditions. The most surprising part was switching to EV mode on downhill sections, watching the battery percentage increase. This plug-in hybrid system primarily uses electric power below 80km/h, with the engine directly driving the vehicle above 80km/h. I recommend checking the coolant before long trips, as poor heat dissipation can cause frequent engine start-stop cycles, increasing fuel consumption. My total mileage of 12,000 kilometers shows a combined fuel consumption of 4.9L/100km, slightly higher than the manual's stated 4.5L/100km but still completely acceptable.

To focus on fuel consumption, it's essential to understand BYD's hybrid technology. The DM-i system utilizes a highly efficient engine and dual motors, allowing the motors to cover 90% of driving conditions. I've experienced the motor's instant response during sudden acceleration while the engine RPM remains stable in the efficient range. For daily commuting, setting the SOC at 25% is optimal, ensuring battery preservation without increasing fuel consumption. In summer, using air conditioning increases actual consumption by about 0.5L, while rainy conditions increase driving resistance by approximately 4%. The manufacturer recommends changing the engine oil every 7,500 kilometers after the first maintenance, as using oil with excessive viscosity will significantly increase fuel consumption.