What Revs for fuel efficiency?
- Thread starter hsyben
- Start date
Scottish Borders
In any ICE peak torque is usually the best mean specific fuel consumption...but I suspect that's not what you were asking?
I suspect you were asking what's the best fuel economy measured in miles per gallon..
Since drag is in simple terms the square of the speed it will be as slow as possible in a gear that is way less than peak torque
I suspect you were asking what's the best fuel economy measured in miles per gallon..
Since drag is in simple terms the square of the speed it will be as slow as possible in a gear that is way less than peak torque
Shropshire, UK
Having had a 2.5i and then a 3.0si the best thing you can do for fuel efficiency in the 2.5i is fit a 6 speed gearbox 
Under 3k is my rule of thumb for petrol cars, although I never noticed that much of a difference on an economy run in the 2.5i rather than pressing on. Maybe 5-7mpg difference overall. It would manage 40mpg+ on a long run though.
Under 3k is my rule of thumb for petrol cars, although I never noticed that much of a difference on an economy run in the 2.5i rather than pressing on. Maybe 5-7mpg difference overall. It would manage 40mpg+ on a long run though.
Revs are directly related to road speed. The rule of thumb used to be get into top gear as quickly as you can and use the lightest possible touch on the throttle pedal to get the revs and therefore speed that you want without labouring the engine.
I'm not so sure this is still true with modern fuel injected engines as planting the pedal doesn't dump a load of petrol into the engine like a carburettor would do.
You could always keep an eye on the computer?
I'm not so sure this is still true with modern fuel injected engines as planting the pedal doesn't dump a load of petrol into the engine like a carburettor would do.
You could always keep an eye on the computer?