Fuel Consumption Comparison at 100 km/h and 120 km/h on Highways

[CharlieRose]

When the speed is 100km/h, the average fuel consumption is 5.3L/100km; when the speed is 120km/h, the average fuel consumption is 6.5L/100km. Below is an introduction to fuel consumption-related content: Fuel Consumption: The fuel consumption of large-displacement cars is as high as that of family cars. Comparison: For a fuel consumption of 6 liters per 100 kilometers, on the same route, a 1.6L car like the Octavia consumes 7 liters. Sports cars typically require much more throttle input than street cars, resulting in higher fuel consumption. For example, a liter-class sports car during intense acceleration or high-speed runs can have fuel consumption comparable to the combined fuel consumption of a 3.0L car. Fuel: Most cars use gasoline, so the energy from the fuel is the same. The relatively higher fuel consumption of the Octavia comes from its high wind resistance, compact structure leaving no room for fuel-saving technologies, and a design philosophy that emphasizes high RPMs to extract power.

[IsabelaFitz]

The fuel consumption difference between driving at 100 km/h and 120 km/h on highways is quite noticeable. Generally, when speed increases from 100 to 120 km/h, wind resistance surges significantly, forcing the engine to rev higher to maintain speed, which increases fuel consumption. For example, in cars I've driven, the average fuel consumption at 100 km/h is about 7 liters per 100 kilometers, but it jumps to 8.5 or even 9 liters at 120 km/h—an increase of roughly 15%. This varies by vehicle model; cars with better aerodynamics might see less impact, while SUVs experience much more dramatic increases. Other factors like tire pressure also play a role—low tire pressure leads to higher fuel consumption. For fuel-efficient highway driving, maintaining around 100 km/h is recommended—it's both safer and more economical. If you're in a hurry and need to go 120 km/h, be aware that your fuel tank will drain much faster.

[VonJessica]

From a cost-saving perspective, driving at 100 km/h is significantly more fuel-efficient than 120 km/h. Based on my real-world test over a 500 km highway trip, maintaining 100 km/h kept fuel consumption under 35 liters, whereas driving at 120 km/h burned an extra 5-8 liters of fuel – equivalent to spending 50 yuan more. This difference stems from increased wind resistance and greater engine workload, as if towing extra weight. For frequent long-distance drivers, saving hundreds annually is easily achievable through cumulative savings. However, don't solely focus on speed – proper vehicle maintenance is equally crucial. Issues like dirty air filters or low tire pressure can cause additional fuel consumption. In summary, choosing 100 km/h is more economical. While it may take slightly longer, it's gentler on your wallet and carries lower safety risks.

[Pluto]

When driving my own car, I've noticed a significant difference in fuel consumption between 100 km/h and 120 km/h. For most models, the average is 7.5 liters per 100 km at 100 km/h, but it jumps to 9 liters at 120 km/h, making the engine seem like it's working harder. This change is due to doubled air resistance and increased engine load, especially noticeable when going uphill. To save fuel, I often set the cruise control at 100 km/h—it's hassle-free and quieter. Sometimes pushing to 120 km/h is fine when in a hurry, but it hurts when gas prices are high. I recommend checking your car's manual for the optimal speed range; most vehicles are most fuel-efficient between 80-100 km/h.