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Addendum (fuel consumption vs speed)
Posted by R. Frist [Email] (more from R. Frist) on Tue, 11 Oct 2005 05:02:32
In Reply to: Ells is correct but......., R. Frist, Tue, 11 Oct 2005 04:30:43
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I just googled "mileage speed" and came up with the following from the How Things Work site:
The power to push a car down the road varies with the speed the car is traveling. The power required follows an equation of the following form:
road load power = av + bv2 + cv3
The letter v represents the velocity of the car, and the letters a, b and c represent three different constants:
* The a component comes mostly from the rolling resistance of the tires, and friction in the car's components, like drag from the brake pads, or friction in the wheel bearings.
* The b component also comes from friction in components, and from the rolling resistance in the tires. But it also comes from the power used by the various pumps in the car.
* The c component comes mostly from things that affect aerodynamic drag like the frontal area, drag coefficient and density of the air.
So the optimum speed for maximum mileage depends upon the values of constants unique to a given car. According to How Things Work this usually falls between 40 and 60 mph.
posted by 151.201.22...
Posts in this Thread:
- Can we start a list of items that effect MPG?, Brian, Mon, 10 Oct 2005 05:02:16
- using 93 octane? clogged filters? check plugs, Mark Plumlee, Mon, 10 Oct 2005 11:40:55
- Cold air. 2-3 mpg drop during MN winter for me - n/m, Colin, Mon, 10 Oct 2005 09:25:28
- Re: Can we start a list of items that effect MPG?, ussakl, Mon, 10 Oct 2005 08:50:39
- Re: Can we start a list of items that effect MPG?, albanysaab, Mon, 10 Oct 2005 08:19:30
- windows down, electrical power consumption, LeoNL, Mon, 10 Oct 2005 08:18:53
- rain and snow, Stephen Goldberger, Mon, 10 Oct 2005 08:05:31
- Re: Can we start a list of items that effect MPG?, R. Frist, Mon, 10 Oct 2005 06:25:50
- Re: Can we start a list of items that effect MPG?, yyzvisitor, Mon, 10 Oct 2005 05:53:39
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