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Using tyres of different makes
Over-inflated tyres
Under-inflated tyres
Using tyres that are new or hardly used
Explanation: If your tyre pressures are lower than those recommended by the manufacturer, there will be increased rolling resistance. To overcome this, the engine will have to work harder, resulting in increased fuel consumption. Check your tyre pressures at least once a week.
Category: Band 2 traffic signs and signals
References: The Official DVSA Guide to Driving: Section 17
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