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Just wondering if tyre pressures were an average of 2PsI down on recommend 30PSI, how much this would effect fuel consumption and would the effect become less when traveling faster.
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Well, I?m not an engineer or mechanic, but i would say that the effect of losing about 2psi would be negligible. You might lose about 1-2mpg depending upon the car, but not enough for you to be able to measure. The effect may not be as great at higher speed as the air in the tyre will heat up and therefore expand, raising the pressure of the tyre.
I think there are to many ifs and buts to be able to answer this question accurately, because it would it not depend upon the car, its weight, tyre size, tyre design etc?
One last note, I wouldn't personally let my tires be any further than 2psi (max) from the manufacturers spec. (is it worth the risk?)
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I always keep my tyres' pressures at 3-4psi above the recommended figure - saves having to up them when going on the motorway.
It also offers slightly less rolling resistance, especially at slow speeds, so aids fuel consumption.
A Michelin tyre rep once told me that more important than maintaining absolutely accurate tyre pressures, was that the ratio between the front and back tyres was retained (unless both sets require the same pressure figure).
Tyres that have pressures that are too low - a puncture for instance - will cause a vehicle to understeer or oversteer depending on which tyre(s) is(are) affected.
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What\'s for you won\'t pass you by
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Well, any kind of drag-resistance increases exponentially with speed, whether it be drag of a boat in water, or coeficient of drag of a car, or rolling resistance of a tyre, but then as said above, increases in speed also increase temperature and therefore pressure, and also the tyre will balloon slightly at high speeds, so I think it's safe to say that the are too many variables to say for.
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Over-pressure tyres tend to wear out the centre of the tread first, or at least they used to. And I guess the oposite is probably true, more wear on the outside of the tread with low pressure.
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>>One last note, I wouldn't personally let my tires be any further than 2psi (max) from the manufacturers spec. (is it worth the risk?)
I'd be astonished if 2psi gave rise to a material difference in tyre pressure - but I might be wrong...
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"I'd be astonished if 2psi gave rise to a material difference in tyre pressure - but I might be wrong..."
That would be about 2psi ;
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Don't know how about mpg, but it certainly affects the handling on our C5. I knew there was something amiss today when out in the car as the handling was terrible. Sure enough, the front offside tyre was 0.5 bars below what it should be. The rest were also low, but not by the same amount. Why the offside one should have lost so much I don't know, as it never has before and I will have to keep a close eye on it in case there is a slow puncture. Anyway, after getting the tyres to their correct pressure, the handling was fine.
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