--- title: "Which of the following is most likely to wast… | Theory Test" description: "Which of the following is most likely to waste fuel? The correct answer is “Under-inflated tyres”. Read the instructor's explanation of the rule behind this s" lang: en json-ld: | [ { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://fasttrackdrivinglessons.co.uk/#organization", "name": "Fast Track Driving Lessons", "url": "https://fasttrackdrivinglessons.co.uk/", "email": "info@fasttrackdrivinglessons.co.uk", "areaServed": "GB", "description": "Intensive driving courses and driving lessons across the UK with DVSA-approved instructors." }, { "@type": "WebSite", "@id": "https://fasttrackdrivinglessons.co.uk/#website", "url": "https://fasttrackdrivinglessons.co.uk/", "name": "Fast Track Driving Lessons", "publisher": { "@id": "https://fasttrackdrivinglessons.co.uk/#organization" }, "potentialAction": { "@type": "SearchAction", "target": { "@type": "EntryPoint", "urlTemplate": "https://fasttrackdrivinglessons.co.uk/search?q={search_term_string}" }, "query-input": "required name=search_term_string" } } ] }, { "@context": "https://schema.org", "@type": "QAPage", "mainEntity": { "@type": "Question", "name": "Which of the following is most likely to waste fuel?", "text": "Which of the following is most likely to waste fuel?", "answerCount": 1, "acceptedAnswer": { "@type": "Answer", "text": "Under-inflated tyres. Under-inflated tyres create more rolling resistance on the road, forcing the engine to work harder and consume more fuel. Checking your tyre pressures regularly ensures safety and helps keep running costs down, as advised in the Highway Code. By contrast, driving smoothly at lower speeds actually improves fuel efficiency, and mixing fuel brands makes no difference." }, "suggestedAnswer": [ { "@type": "Answer", "text": "Driving on motorways" }, { "@type": "Answer", "text": "Driving at a lower speed" }, { "@type": "Answer", "text": "Using different brands of fuel" } ] } } ] --- Get an exclusive 15% off - Offer ends next week! 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DVSA-style practice question · Safety and your Vehicle ## The answer options - Under-inflated tyres**Correct** - Driving on motorways - Driving at a lower speed - Using different brands of fuel ## Why that is the answer Under-inflated tyres create more rolling resistance on the road, forcing the engine to work harder and consume more fuel. Checking your tyre pressures regularly ensures safety and helps keep running costs down, as advised in the Highway Code. By contrast, driving smoothly at lower speeds actually improves fuel efficiency, and mixing fuel brands makes no difference. ## How this comes up in the real test Questions from safety and your vehicle appear throughout the 50-question multiple-choice section, and the wording changes between versions. Learn the rule rather than the sentence: the DVSA can ask the same point from the opposite direction, and a memorised answer falls over the moment the phrasing moves. 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