Team-BHP - View Single Post - ARTICLE: How to get the maximum Fuel Efficiency

Abhay.Neelwarne · 17th August 2008, 19:55

This is great thread. I went through whole of it. I see bottomelines as sane gentlemen like driving for in-city and a fairly fair speed on highways as key to FE. Seems like around 90kmph seems to be a good speed for optimum FE on highways.

Highway FE: You have

A) vehicle momentum (proportional to velocity) to help you and
B) drag force (square of velocity) and rolling resistance (constant) against.

To bridge the gap between A & B, you have engine power. Right?? Now to say that 90kmph as a good speed for FE could be oversimplification. My arguement is "where is the turbo effect" factored into these arguements?? Turbo can be seen as giving high power or on the otherhad less fuel consumption for the same power. Every car with turbo would have different settings for when the turbo kicks in.

In my opinion, driving with light foot at an RPM about 10-20% more than the RPM at which turbo kicks in should give you the best engine efficiency and the perfect balance between +ve and -Ve forces which are acting on your car and lead to best highway FE???

In my Swift Dzire ZDi, turbo kicks in at about 2000 rpm. In my next 900kms Bangalore-Pune trip this week, I am going to drive steady at 2400 following all the feedback on this thread and report. Lets see.

Any comment??

17th August 2008, 19:55	#175 (permalink)
Abhay.Neelwarne Newbie Join Date: May 2008 Location: Mysore Posts: 14	This is great thread. I went through whole of it. I see bottomelines as sane gentlemen like driving for in-city and a fairly fair speed on highways as key to FE. Seems like around 90kmph seems to be a good speed for optimum FE on highways. Highway FE: You have A) vehicle momentum (proportional to velocity) to help you and B) drag force (square of velocity) and rolling resistance (constant) against. To bridge the gap between A & B, you have engine power. Right?? Now to say that 90kmph as a good speed for FE could be oversimplification. My arguement is "where is the turbo effect" factored into these arguements?? Turbo can be seen as giving high power or on the otherhad less fuel consumption for the same power. Every car with turbo would have different settings for when the turbo kicks in. In my opinion, driving with light foot at an RPM about 10-20% more than the RPM at which turbo kicks in should give you the best engine efficiency and the perfect balance between +ve and -Ve forces which are acting on your car and lead to best highway FE??? In my Swift Dzire ZDi, turbo kicks in at about 2000 rpm. In my next 900kms Bangalore-Pune trip this week, I am going to drive steady at 2400 following all the feedback on this thread and report. Lets see. Any comment?? __________________ SX4 ZXi, Swift DZire ZDi........ Sair kar duniya ki ghalib, jindgani fir kahan Jindgani gar rahe, to noujawani fir kahan....