--- title: "When you drive at 70 mph instead of 50 mph, h… | Theory Test" description: "When you drive at 70 mph instead of 50 mph, how much more fuel will you use? The correct answer is “Around 15%”. Read the instructor's explanation of the rule" 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": "When you drive at 70 mph instead of 50 mph, how much more fuel will you use?", "text": "When you drive at 70 mph instead of 50 mph, how much more fuel will you use?", "answerCount": 1, "acceptedAnswer": { "@type": "Answer", "text": "Around 15%. Driving at higher speeds greatly increases aerodynamic drag, forcing your engine to work much harder to maintain momentum. According to official DVSA guidance, driving at 70 mph uses around 15% more fuel than driving at 50 mph. While drivers often overestimate the extra consumption at 30% or 40%, or underestimate it at 5%, 15% is the accurate average. Easing off the accelerator saves fuel, lowers emissions, and keeps your vehicle running costs down." }, "suggestedAnswer": [ { "@type": "Answer", "text": "Around 40%" }, { "@type": "Answer", "text": "Around 30%" }, { "@type": "Answer", "text": "Around 5%" } ] } } ] --- Get an exclusive 15% off - Offer ends next week! 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DVSA-style practice question · Safety and your Vehicle ## The answer options - Around 15%**Correct** - Around 40% - Around 30% - Around 5% ## Why that is the answer Driving at higher speeds greatly increases aerodynamic drag, forcing your engine to work much harder to maintain momentum. According to official DVSA guidance, driving at 70 mph uses around 15% more fuel than driving at 50 mph. While drivers often overestimate the extra consumption at 30% or 40%, or underestimate it at 5%, 15% is the accurate average. Easing off the accelerator saves fuel, lowers emissions, and keeps your vehicle running costs down. ## 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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