What are the reasons for the high fuel consumption of the Besturn B70?
3 Answers
The official combined fuel consumption of the Besturn B70 is 7.5-7.6L/100km, which is relatively economical. If the fuel consumption suddenly increases, it may be due to excessive carbon deposits in the engine or a faulty oxygen sensor. It is recommended to go to a 4S shop for inspection. The reasons for the increasing fuel consumption of the car are as follows: 1. The impact of temperature on fuel consumption fluctuations: Generally, in winter when the temperature is low, fuel consumption will increase somewhat, almost comparable to the fuel consumption when using air conditioning in summer. This is because the engine emits more heat at low temperatures. 2. The vehicle has not been maintained for a long time: Dirty engine oil and air filters can also lead to increased fuel consumption. Dirty engine oil results in poor lubrication, increasing the resistance of various moving parts of the engine, requiring more energy to overcome the resistance, thus increasing fuel consumption. 3. The spark plugs need to be replaced: Spark plugs are often overlooked. Although they can still be used, insufficient ignition energy can cause delayed ignition, missing the optimal ignition time.
I previously drove a Bestune B70 and found its high fuel consumption was mainly due to the sporty engine tuning. Although the 1.5T turbocharged engine delivers strong power, frequent start-stop in congested urban areas is particularly fuel-intensive. With a body weight of 1.48 tons, I had to step hard on the accelerator every time I started, and the slow gearshift response of the transmission made it even more fuel-consuming. When the air conditioning compressor kicks in during summer, fuel consumption directly increases by 1-2 liters. Later, I adjusted my driving habits—anticipating red lights to avoid sudden braking and using cruise control on elevated roads—which helped reduce fuel consumption from 10 liters to around 8 liters. Older models also have aging oxygen sensor issues; if not replaced, incomplete combustion of the air-fuel mixture can secretly increase fuel consumption.
Many car enthusiasts have complained about the high fuel consumption of the Bestune B70, with the core issue lying in the cooling system design. The car's radiator and turbo cooling efficiency are relatively low, making it prone to triggering the cooling fan's forced high-speed operation during long summer trips, which requires the engine to inject more fuel for cooling. Additionally, the low ground clearance of the chassis means that many owners install underbody panels, reducing airflow and increasing engine compartment temperatures. Furthermore, the manufacturer recommends using 0W-30 engine oil, but if the viscosity is insufficient, the piston ring sealing performance decreases, allowing oil to enter the combustion chamber and reducing gasoline combustion efficiency by about 10%. It is recommended to clean the radiator of willow catkins every three months and maintain tire pressure at 2.5 Bar for better fuel efficiency.
