Crosswords2 mins ago
Average speed
I drive moderately so could eaily get up to 62 mpg** in my former 1.9 diesel Skoda.
But the engine may consume more fuel on lengthier journeys compared with identical faster ones.
I doubt there is any formula which can help to work out which is more economical, but maybe someone has a comment about this.
** including habitual coasting; My 1.6 petrol NOTE achieves a disappointing 51 mpg.
But the engine may consume more fuel on lengthier journeys compared with identical faster ones.
I doubt there is any formula which can help to work out which is more economical, but maybe someone has a comment about this.
** including habitual coasting; My 1.6 petrol NOTE achieves a disappointing 51 mpg.
Answers
1 to 2 of 2
Best Answer
No best answer has yet been selected by Segilla. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.
Fuel efficiency drops off very rapidly with speed - As I recall the wind resistance is proportional to the cube of the speed so you get a curve like this:
http://www.drive55.org/downloads/tdiclubchart. gif
you also should check out point 102 here
http://www.highwaycode.gov.uk/09.htm
http://www.drive55.org/downloads/tdiclubchart. gif
you also should check out point 102 here
http://www.highwaycode.gov.uk/09.htm
Your Skoda probably has the 1.9TDI diesel engine. Maximum engine torque is developed between 1800 and 2400RPM. In top gear at 60mph the engine speed is 2000RPM which is near its maximum efficiency.
Most of the counter force on a car is air resistance and most of the work done by the engine simply pushes aside the air. If you double the speed of your car you quadruple the air resistance. The most efficient speed for your Skoda diesel is probably around 60mph.
Diesels are inherently more efficient than petrol cars on account of their greater compression ratio and can convert approximately 40% of the chemical energy in the fuel to useful work (nearer 20% for petrol engines)
Most of the counter force on a car is air resistance and most of the work done by the engine simply pushes aside the air. If you double the speed of your car you quadruple the air resistance. The most efficient speed for your Skoda diesel is probably around 60mph.
Diesels are inherently more efficient than petrol cars on account of their greater compression ratio and can convert approximately 40% of the chemical energy in the fuel to useful work (nearer 20% for petrol engines)
1 to 2 of 2
