Mark one answer
When its tyres are of different makes
When its tyres are new
When its tyres are over-inflated
When its tyres are under-inflated
Explanation: Check your tyre pressures frequently - normally once a week. If they're lower than those recommended by the manufacturer, there will be more 'rolling resistance'. The engine will have to work harder to overcome this, leading to increased fuel consumption.
Category: Safety and your motorcycle
References: The Official DVSA Guide to Riding: Section 15, The Official DVSA Guide to Riding: Section 17
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