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post #11 of 18 (permalink) Old 10th July 2006
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A guy at my local indy tyre place has a magnetic system fixed around the fuel lines on his motorbikes. He reckons it gives a noticible fuel economy and thinks it may be quite substantial in a car. Of course he may be riding more economically as he has it fitted. I think the theory is that the fuel is polarized by the magnets and therefore bonds better to the oxygen in the carb / cylanders thus producing a more efficient burn ratio.
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post #12 of 18 (permalink) Old 10th July 2006
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I heard about an oil additive that thins the oil and oil is supposed to be the thickness is comes supplied at. The reason being to give the right lubrication at ceartain pressures and tempuratures.
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post #13 of 18 (permalink) Old 10th July 2006
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Originally Posted by nthesx
i know all about the open windows,aircon and roofbars and stuff but cant never work out how "braking harshley"can effect fuel consumption


It's all to do with driving "smoothly"!
Approach a junction and apply brakes at the last minute not only wears brakes out quicker it uses more fuel, as you are trying to stop a heavy lump of metal quickly. Brake gradually and the slowing down process is smoother, less friction and hence more economical.

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post #14 of 18 (permalink) Old 10th July 2006
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The trick is to use the brakes as little as possible, within the bounds of safety of course.

Basic physics is to blame. When you accelerate, you use fuel to add to the car's kinetic energy. When maintaining speed, you use fuel to maintain that kinetic energy against the drag of mechanical and wind resistance. When you brake, you convert that kinetic energy into heat in the brake components, which is then 'thrown away' into the atmosphere.

If you pace yourself to minimise braking, then you'll find yourself decelerating more before braking and anticipating the need to slow down so that in some instances you might not need to brake at all.

At its worst, you see some people on the motorway, obviously unhappy with the speed of the traffic, constantly edging up to the car in front then braking slightly. If they left a bit more of a gap, they wouldn't have to brake at all unless the car in front did. In fact, if you're driving at a sensible distance behind, you shouldn't have to 'reflex brake' every time you see the brake lights on the car in front.

Apologies if I'm stating the bleeding obvious, but I see far too many people driving like that, and I bet half of them wonder why they're getting such lousy fuel economy.
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post #15 of 18 (permalink) Old 10th July 2006
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Originally Posted by nthesx
i know all about the open windows,aircon and roofbars and stuff but cant never work out how "braking harshley"can effect fuel consumption

Braking harshly does not affect your fuel consumption!

It is what you do before braking harshly that wastes fuel and also wears other components of your car and can be dangerous.

Why keep your foot down after seeing an obstruction well ahead where you know you will have to stop and break harshly in the last few metres? If you take your foot off and just let the engine slow you down for the length of road this takes you will not be using any fuel. Do this every time and your consuption of fuel will drop dramaticaly!
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