When will your vehicle use more fuel?
- A When its tyres are under-inflated
- B When its tyres are of different makes
- C When its tyres are over-inflated
- D When its tyres are new
Why this is the answer
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.
Why the other answers don't fit
- B
- When its tyres are of different makes — Different makes do not change rolling resistance meaningfully.
- C
- When its tyres are over-inflated — Over-inflation is bad for grip and wear, but it does not raise fuel use.
- D
- When its tyres are new — New tyres are in their best condition.
Where this comes from
- Driving: the essential skills — section 17
Rule numbers link to The Highway Code on gov.uk.
Where this question comes from
The question, its options and the explanation are reproduced word for word from the DVSA revision question bank under licence. The licence requires them to appear unaltered, so we cannot reword them and neither can anyone else — that is why you will meet the same wording on other sites. Everything else on this page is written by Theory Hub: the explanation of why each wrong answer is wrong, the topic guide and the revision notes.
Asked in: Car , Motorcycle
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