What is the best speed to get maximum fuel average in 1300cc manual city?

[ZainMahdi]

There is something interesting that I established over the weekend that may be of interest to the OP here. My LX470, with the aerodynamics of a shiny barndoor, gets 14.3 mpg at 70 mph, and gets 14.8 mpg at 80 mph. Engine efficiency near the torque peak matters too.

It can be due to a tailwind, varying terrain elevation, or even temperature differences between the 70 mph and 80 mph trip; a big truck like that suffers a greater penalty, compared to smaller cars, when faced with increased drag at a greater speed.

There is no way it can achieve greater mpg at 80 compared to 70 with reasonably similar environment variables. Unless of course it frequently slips its torque converter at 70 mph, and not at 80.

[VCheng]

It can be due to a tailwind, varying terrain elevation, or even temperature differences between the 70 mph and 80 mph trip; a big truck like that suffers a greater penalty, compared to smaller cars, when faced with increased drag at a greater speed.

There is no way it can achieve greater mpg at 80 compared to 70 with reasonably similar environment variables. Unless of course it frequently slips its torque converter at 70 mph, and not at 80.

My observation is pretty robust Sir. I was just as surprised as you are. All the variables you mention I excluded. The point here is that as aerodynamic drag rises with the square of the speed, there may be a small area on the graph where gearing will make a higher speed more economical. That is the sweet spot, and it would vary for every vehicle.

[sk_020]

90 kph according to my experience and I'm driving this car since 2009.

Engaging 5th gear at 60kph is a bad idea and puts load on engine.

Change gears at 3k rpms and accelerate moderately.
I'm getting 16 kmpl locally in Islamabad.

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