4x4 Economy - Fuel Saving

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4x4 Economy - Fuel Saving - The Environment

This is a draft document for comment and has not been finalized

All motorists use fuel and hence contribute to pollution and global warming, so what can we do about it?

Over the past few months 4x4web has been contacted several times by press, TV and radio for its views on 4x4's and the environment. This is a subject that is important to everybody and not just to the environmentalists.

I hope by this web page to perhaps bring a new slant on a subject that has been well aired. I have looked at this in 2 ways. Firstly the usual way, and then in my own way.

All the usual stuff (still very important)

A Scientific sideways look at fuel economy

(Note it is a long time since I did my degree at Imperial College in London, any help with the below appreaciated)

Fuel use is tied up with Force and Energy

f=ma
Force = Mass x Acceleration

To get to the top of a hill we must increase our potential energy.

e = mgh
Potential energy = mass x acceleration due to gravity x height.

Aerodynamic Drag
D = ½ρv2CdA

When we brake we have to loose Kinetic Energy

KE = ½:mv2

You will see that m or v appears in all the above. Lets see how we can cut our fuel use/pollution production.

The Force Equation f=ma

The mass of the vehicle. For simplicity we will regard mass and weight as similar. By reducing the mass we reduce the force and hence fuel used. Note that Mass in the above formulae is not raised to a power so doubling the mass doubles the force needed, and halving the mass halves the force needed to achieve a given acceleration.

Potential Energy e=mgh

Here again we have mass not raised to a power. So a 10% decrease in mass reduces by 10% the potential energy that needs to be gained to get to the top of a hill.

Drag (aerodynamic) Equation

D = ½ρv2CdA

What can we effect here. The Coefficient of drag is mainly as a result of the design as is the cross sectional area A. However we can affect both of these if we have a roofrack fitted. A roofrack will both increase the Cd and increase the A (plus also add a bit of m although that dosn't come into thie equation). However the biggy is v or v2 as it actually is. This is a squared relationship so increasing speed from say 60 mph to 75 mph increases the contribution from 60x60=3600 to 75x75=5625. ie a 25% increase in speed produces a 56% increase in drag. Even 70 mph to 75 mph, a 7% increase in speed produces a 14% increase in drag.

So what can we do????

Answer... Think fuel economy. This does not need to be at an extreme level just think about it.

4x4web is willing to consider testing any fuel saving device supplied to it. The results will be honest. I cannot be bought by a supplier.

Nigel Leak

To be continued.....

What do cooling towers at a power station do?????

Answer provide global warming.


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