Are Diesel Cars Fuel-Consuming?

[MaggieDella]

In fact, diesel cars are not considered fuel-consuming. Fuel consumption depends on the horsepower of the engine, and different horsepower engines have varying fuel consumption rates. Additionally, different types of diesel vehicles also exhibit different fuel consumption levels. Specific models are as follows: 1. Large freight vehicles. 110/100 (engine horsepower/10) = fuel consumption per 100 kilometers. 2. Light diesel vehicles. 120/100 (engine horsepower/15) = fuel consumption per 100 kilometers. 3. Passenger cars. 130/100 (engine horsepower/20) = fuel consumption per 100 kilometers. Furthermore, factors such as the vehicle's age, transmission structure, gear ratio, maximum speed, driving conditions, and the driver's habits, among many others, also play a significant role.

[OPiper]

As someone who has driven trucks for over a decade, I can tell you diesel vehicles aren't actually fuel-guzzlers. On the contrary, they're much more fuel-efficient than gasoline vehicles of the same displacement. Diesel engines have higher compression ratios, with thermal efficiency exceeding 45%, while gasoline engines barely reach 30%. When hauling one ton on highways, my 6-liter diesel engine consumes only 12 liters per 100 km, whereas my friend's gasoline light truck with equivalent horsepower drinks 18 liters. Of course, fuel consumption depends on load and road conditions - even empty trucks consume around 10 liters in city driving. Nowadays, new diesel vehicles come with urea systems requiring regular AdBlue refills, which adds to the operating costs.

[FaithMarie]

My diesel pickup truck has clocked over 50,000 kilometers, and the fuel consumption is truly impressive. It averages just over 8 liters per 100 kilometers in the city, and drops below 7 liters on long-distance drives. Diesel engines operate at lower RPMs with higher torque, making hill climbs particularly effortless while requiring fewer gear shifts. The key advantage is that diesel fuel is significantly cheaper than 92-octane gasoline – at current prices, it costs only 0.6 RMB per kilometer. However, remember to switch to winter-grade diesel in cold seasons. Last year I forgot to change the fuel type and almost couldn't start the engine at -10°C. Also, China VI emission-compliant diesel vehicles require regular DPF regeneration maintenance, otherwise the clogged exhaust system will actually increase fuel consumption.

[AliceLynn]

I've personally experienced the fuel efficiency of diesel cars. Last month, I drove a friend's 2.0T diesel Tiguan through mountainous areas with five people and luggage onboard, air conditioning running the whole time, and it only consumed 6.8 liters per 100 kilometers. My own 1.8T gasoline version consumes over 9 liters on the same route. However, diesel cars require more meticulous maintenance, especially the fuel injectors which are quite delicate - using poor-quality diesel can ruin them. At the repair shop last time, I saw an owner whose injectors got clogged at just 20,000 kilometers, costing over 6,000 yuan in parts alone. Nowadays, new hybrid cars also have low fuel consumption, but the fact that diesel cars can run 900 kilometers on a single tank is truly impressive.

[StJude]

Seven years of experience driving diesel cars: Fuel consumption mainly depends on the matching of the three major components. My manual transmission diesel sedan, equipped with a 6-speed gearbox and a small turbo, runs at only 1600 RPM when cruising at 80 km/h, consuming just 5 liters per 100 km. However, automatic transmission diesel cars lose about 10% of power due to the torque converter, which increases fuel consumption. Recently, I test-drove a new diesel SUV with a 48V mild hybrid system, using electricity for starting and diesel for running, achieving a combined fuel consumption of less than 7 liters. Currently, the quality of diesel at gas stations varies greatly, so I always refuel at Sinopec, and my engine has had no issues in six years.

[StRiley]

Diesel cars are indeed fuel-efficient, but it depends on the driver. When I drove a diesel SUV to Tibet, the fuel consumption varied by 3 liters among six vehicles in the same convoy. Old Zhang drove too aggressively, downshifting and revving up on every slope, using 12 liters per 100 km. I kept the RPM below 2000 and used the air conditioning throughout the trip, consuming only 9 liters. I recommend installing an OBD fuel consumption monitor to see the fuel injection rate in real-time. For current China VI diesel engines, pay attention to the DPF particulate filter—frequent short-distance driving can cause clogging, requiring highway runs for regeneration.