As far as raising the speed from 100 km/h to 200 km/h increases fuel consumption

Greatly increases fuel consumption as the speed increases.

Have you thought ever, how much increased fuel consumption with increasing speed? Yeah, already long known fact that the most economical mode of movement of the car occurs at a speed of 90 km/h. of Course, to give a precise answer to our question, we need to know what model car are we talking about, because each car’s individual fuel consumption, depending on the technical characteristics. Nevertheless, the question is still very interesting. We have tried to answer it.

We needed a lot of time and research to gather data on the real fuel consumption of cars (unfortunately, the official factory specification for fuel consumption in most cases has nothing to do with reality). The result of our research are shown below.

The figures are taken from the database of the publication “Automobil Catalog”, they were published from 1987 to 1996 in a Swiss automobile magazine “Automobil Revue”. In those years the magazine published detailed data on the various cars that the experts were testing at speeds from 60 to 180 km/h.

Unfortunately, for security reasons, the magazine has not tested the car at speeds of 200 km/h. fortunately, the extrapolation according to the published in those years data it is possible to obtain fairly accurate figures on fuel consumption on such a high speed.

Here is the first table on the gasoline cars:

With regards to the diesel models, we found only data on the three cars with engines with direct injection. Older cars with indirect injection of fuel are obsolete, and their fuel economy is no longer relevant

The result of research based on the data of measurements of the Swiss magazine, shows that the magnification factor of the fuel (R) during acceleration from 100 to 200 km/h is from 1,86 to 4.49.

In the graph above show the average power in kW absorbed by the modern car due to rolling resistance (red), aerodynamic resistance (blue) and total resistance (yellow). For speed of 100 km/h needs about 14 kW. For acceleration to 200 km/h requires about 80 kW. The difference (ratio) of power necessary for movement in two speeds is 5.7. But this number is divided by 2 to find the energy for movement at a certain distance.

Below is a chart published by the company for Volkswagen Golf 1.4 TSI. Interestingly, this car has a top speed of 200 km/h, which is provided by the engine power of 90 kW. The result is that the fuel consumption of this car at speeds of 200 km/h will be 15 l/100 km.

Thanks to the 6th gear (2,66 total transmission torque) and tires 205/55R16 VW Golf engine running at 200 km/h at a speed of 4600 rpm According to the power curve and torque to 200 km/h car consumes 89 kW.

By the way, here’s another picture of the fuel consumption of the Volkswagen Golf with a 1.4-liter engine with increasing speed:

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