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Originally posted by pseight

I am going to stick my neck out and say:

1. If everyone coasts from light to light, and applies their brakes well ahead of a red light, this will increase traffic congestion, especially during peak hours, and there will be an increase in consumption due to increased traffic density. Please be aware of your fellow motorists, and go with the flow. Don't create traffic.

2. Know your vehicle. How your vehicle consumes fuel is very much a function of its hp/torque curve, and rpms at cruising speed. My Toyota vehicles give crappy mileage with jackrabbit starts, and above 100. But above 125, the mileage actually improves. My GM pushrod vehicles give excellent mileage with brisk acceleration, because they reach cruising speed quicker, which uses much less fuel. The torque curve on many GM v6's naturally supports brisk acceleration, and there is not much loss of fuel economy at higher speeds.

In short, a flatter torque curve and aerodynamic vehicle will give you more consistent fuel consumption and you will likely achieve the EPA numbers under more varied driving conditions, including higher speeds and brisk acceleration.

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Hello Pramod ji,

Azazf is right. If it pinches, I tend to cut out unnecessary trips.
It acts as a control mechanism.

This is a good site on the subject and useful while purchasing new/used vehicles:

http://www.fueleconomy.gov