The Wrong Fuel Data Repository
Short answer
The UK has no official record of misfuelling. No government body counts incidents, so every national figure in circulation is an estimate from a survey, an operator's callout log, or an extrapolation between the two. This repository collects 8,014 figures, states the method behind each one, grades the source, and shows the arithmetic where a number is derived rather than measured.
Free consultation with a misfuel scientist on 01295 380724, 24 hours, no charge and nothing to buy.
8,014figures in the repositorylive
40cited measurementsfrom 11 sources
300,000estimated UK incidents, 2001peer-reviewed
68.4%drivers who moved the vehicle firstoperational dataset
The headline finding
Across every dataset here, one variable dominates outcome, and it is not the volume of wrong fuel or the make of vehicle. It is whether the engine ran. More than two thirds of drivers move the vehicle before calling anyone, and that single decision is what separates a drain costing hundreds from a fuel-system replacement costing thousands. The median distance driven is 1.5 miles, which is why most cases still end well.
The wrong fuel data repository: cited measurements
peer reviewed · 2001300,000Estimated UK misfuelling incidents in 2001peer reviewed · 2001£35 millionEstimated direct cost of UK misfuelling in 2001trade body · 2014£40 millionEstimated annual UK misfuelling costtrade body · 2014130,000Extrapolated annual UK misfuelling incidentsoperational dataset · 202517,500Specialist fuel drain jobs completed per yearoperational dataset · 202580,000 to 130,000Working estimate of annual UK misfuelling incidentsoperational dataset · 202586.7Share of contamination callouts that are wrong fueloperational dataset · 20259.1Share of contamination callouts that are AdBlueoperational dataset · 202575Share of wrong fuel incidents involving diesel vehiclesoperational dataset · 202575 to 78Share of wrong fuel cases that are petrol into a dieseloperational dataset · 202522 to 25Share of wrong fuel cases that are diesel into a petroloperational dataset · 2025Friday, 29% above SundayBusiest day of the week for wrong fuel calloutsoperational dataset · 2025May and August, ~12% above JanuaryPeak months for wrong fuel calloutsoperational dataset · 202568.4Share of drivers who moved the vehicle before calling for helpoperational dataset · 20251.5Median distance driven after misfuellingoperational dataset · 202593Share of drivers who covered ten miles or feweroperational dataset · 202520Median volume of wrong fuel addedoperational dataset · 202549.7Median technician arrival timeoperational dataset · 2025£150 to £299Typical all-in price of a standard fuel drainsecondary · 2024£120 to £1,000Reported range for draining and flushing a tankoperational dataset · 2025£1,000 to £3,000Cost of fuel pump replacement after driving on wrong fueloperational dataset · 2025£3,000 to £8,000Cost of injectors and pump replacementoperational dataset · 2025£5,000 to £15,000+Cost in the most severe recorded casessecondary · 2024up to £5,000Reported extreme-case repair costconsumer survey · 202529Share of UK motorists who have misfuelled at least onceconsumer survey · 202420Share of UK motorists who have misfuelled, 2024 surveyconsumer survey · 202533Share of men who have misfuelledconsumer survey · 202523Share of women who have misfuelledconsumer survey · 202554Share of drivers aged 18-24 who have misfuelledconsumer survey · 202512Share of drivers aged 55 and over who have misfuelledconsumer survey · 202548Share of London motorists who have misfuelledtrade body · 2014£25 million of £40 millionShare of the annual misfuelling bill attributable to menconsumer survey · 202562Share of car insurance policies not covering wrong fuel damageconsumer survey · 202414Share of policies including misfuelling cover as standardsecondary · 202443Share of reviewed policies including misfuelling as standardsecondary · 202441Share of breakdown policies including misfuelling assistancesecondary · 202480,000+Annual UK searches for what to do about wrong fuelsecondary · 2026163Quarter-on-quarter growth in wrong fuel search demandpeer reviewed · 2013200 to 460Typical mean wear scar diameter for commercial dieselpeer reviewed · 200723 misfuellers, 17 controlsDrivers interviewed in the foundational UK misfuelling study
Derived concentration figures
7,974 pages of arithmetic: every common UK model, against every realistic volume and spend, resolved to a concentration and a risk band. Concentration is what the pump experiences, and it is the number almost nobody calculates before they turn the key.
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Free consultation — £0
Our engine scientists, fuel-system engineers and misfuel specialists would be glad to talk your situation through with you, free of charge. That consultation is what this repository offers: there is no fee, nothing to buy, and no obligation attached to any part of it.
Tell them what went in, roughly how much, and whether the engine has run. That is enough to establish which components are exposed and what the realistic range of outcomes is — and if the answer is that you need nobody at all, they will say so.
Speak to a misfuel scientist — 01295 380724How the consultation works
The full bibliography
Adams, P. and David, G.C. (2007). Light vehicle fuelling errors in the UK: the nature of the problem, its consequences and prevention. Applied Ergonomics, Volume 38, Issue 5.peer reviewed
https://doi.org/10.1016/j.apergo.2006.10.008
The foundational academic study of UK misfuelling. Hierarchical task analysis of the fuelling task plus interviews with 23 drivers who had misfuelled against a control group of 17. Establishes misfuelling as a predictable error pathway created by forecourt conditions rather than individual carelessness.
https://doi.org/10.1016/j.apergo.2006.10.008
The foundational academic study of UK misfuelling. Hierarchical task analysis of the fuelling task plus interviews with 23 drivers who had misfuelled against a control group of 17. Establishes misfuelling as a predictable error pathway created by forecourt conditions rather than individual carelessness.
Mikkonen, S. and Engman, A. (2013). Misfueling: what if gasoline is fueled into a diesel car and vice versa?. SAE Technical Papers.technical paper
https://www.sae.org/publications/technical-papers/content/2013-01-2678/
Direct engineering treatment of both misfuel directions and their effect on fuel-system components.
https://www.sae.org/publications/technical-papers/content/2013-01-2678/
Direct engineering treatment of both misfuel directions and their effect on fuel-system components.
Saikkonen, P., Mikkonen, S., Makela, M. and Niemi, A. (1996). Lubricity of reformulated diesel fuel: experience in Finland. SAE Technical Papers.technical paper
https://www.sae.org/publications/technical-papers/content/961943/
Field evidence that diesel lubricity, not diesel energy content, is what protects an injection pump.
https://www.sae.org/publications/technical-papers/content/961943/
Field evidence that diesel lubricity, not diesel energy content, is what protects an injection pump.
Mikkonen, S. and Tenhunen, E. (1987). Deposits in diesel fuel-injection pumps caused by incompatibility of fuel and oil additives. SAE Technical Papers.technical paper
https://www.sae.org/publications/technical-papers/content/872118/
Documents deposit formation inside injection pumps from fuel contamination — the mechanism behind delayed pump failure after a misfuel.
https://www.sae.org/publications/technical-papers/content/872118/
Documents deposit formation inside injection pumps from fuel contamination — the mechanism behind delayed pump failure after a misfuel.
Agudelo, J., Delgado, A. and Benjumea, P. (2013). Lubricity of ethanol-gasoline fuel blends. Revista Facultad de Ingenieria.peer reviewed
https://www.redalyc.org/articulo.oa?id=43028316005
High-frequency reciprocating rig measurements. Reports typical mean wear scar diameters for commercial diesel of roughly 200-460 micrometres, against markedly worse figures for gasoline — the quantitative basis for the lubricity argument.
https://www.redalyc.org/articulo.oa?id=43028316005
High-frequency reciprocating rig measurements. Reports typical mean wear scar diameters for commercial diesel of roughly 200-460 micrometres, against markedly worse figures for gasoline — the quantitative basis for the lubricity argument.
Fuel Fixer Ltd (2026). Analysis of 57,047 UK fuel drain enquiries, 2024-2025. EIN Presswire.operational dataset
https://www.einpresswire.com/
The largest published operational dataset on UK misfuelling. Self-reported by a commercial provider and drawn from its own callouts, so it describes the population that phones a specialist rather than all UK drivers. Treated here as a strong sample with a stated selection bias.
https://www.einpresswire.com/
The largest published operational dataset on UK misfuelling. Self-reported by a commercial provider and drawn from its own callouts, so it describes the population that phones a specialist rather than all UK drivers. Treated here as a strong sample with a stated selection bias.
RAC (2014). Fuel fiascos: men more likely than women to run out and fill up with wrong type. RAC Media Centre.trade body
https://media.rac.co.uk/
Panel survey of 1,463 UK drivers, plus RAC operational callout volumes. Source of the widely repeated ~130,000 incidents and £40m annual cost extrapolations.
https://media.rac.co.uk/
Panel survey of 1,463 UK drivers, plus RAC operational callout volumes. Source of the widely repeated ~130,000 incidents and £40m annual cost extrapolations.
Go.Compare (2025). Over a quarter of motorists admit to filling up with the wrong type of fuel. Go.Compare.consumer survey
https://www.gocompare.com/car-insurance/misfuelling-cover/
Censuswide survey of 2,000 nationally representative UK consumers, 1,262 of whom own or rent a vehicle, fielded March 2025. Paired with a Defaqto analysis of 322 comprehensive policies.
https://www.gocompare.com/car-insurance/misfuelling-cover/
Censuswide survey of 2,000 nationally representative UK consumers, 1,262 of whom own or rent a vehicle, fielded March 2025. Paired with a Defaqto analysis of 322 comprehensive policies.
Go.Compare (2024). Nightmare fuel: one in five admit to filling up with the wrong fuel. Go.Compare.consumer survey
https://www.gocompare.com/car-insurance/misfuelling-cover/
Sago survey of 2,129 GB adults, 1,724 vehicle owners or renters, weighted to census data. Paired with a Defaqto analysis of 296 policies.
https://www.gocompare.com/car-insurance/misfuelling-cover/
Sago survey of 2,129 GB adults, 1,724 vehicle owners or renters, weighted to census data. Paired with a Defaqto analysis of 296 policies.
Which? (2024). Misfuelling could cost you thousands: can car insurance help?. Which?.secondary
https://www.which.co.uk/news/article/misfuelling-could-cost-you-thousands-can-car-insurance-help-aTMDb1Zt6Ubn
Reviews of 61 car insurance and 44 breakdown policies for misfuelling cover, plus search-demand figures attributed to an Independent Advisor report.
https://www.which.co.uk/news/article/misfuelling-could-cost-you-thousands-can-car-insurance-help-aTMDb1Zt6Ubn
Reviews of 61 car insurance and 44 breakdown policies for misfuelling cover, plus search-demand figures attributed to an Independent Advisor report.
MoneySuperMarket (2026). This one mistake could cost UK drivers up to £1,000. MoneySuperMarket.secondary
https://www.moneysupermarket.com/car-insurance/news/
Reports a sharp quarter-on-quarter rise in UK search demand for wrong-fuel terms in early 2026, and a £120-£1,000 drain cost range.
https://www.moneysupermarket.com/car-insurance/news/
Reports a sharp quarter-on-quarter rise in UK search demand for wrong-fuel terms in early 2026, and a £120-£1,000 drain cost range.
Common questions
Can I drive with wrong fuel?
No. Starting or driving pumps it through the system and can turn a straightforward drain into an expensive repair. Leave the vehicle where it is and call 01295 380724.
How long does the drain take?
About 45 to 90 minutes on site once the technician arrives. Vehicles that were started or driven take longer, because the lines and filter need flushing as well as the tank.
How much does it cost in the UK?
Published UK figures run from about £120 to £1,500 depending on the vehicle, how much wrong fuel is in the tank and whether the engine was started. Talking through which end of that range applies to you costs nothing — that consultation is what this repository offers.
Will it have damaged the engine?
Only if it has been run through the system. Caught before starting, it sits in the tank and a drain removes it cleanly.
Does insurance cover it?
Often not. Most car insurance policies exclude misfuelling as standard, though some breakdown policies and optional add-ons include it. Check your own wording.
Do you cover the UK?
Yes. Mobile technicians attend forecourts, roadsides, homes and workplaces across the UK, 24 hours a day.
Across the Fuel Fixer network
- International repository — the same evidence base outside the UK.
- Field operations — the operator that attends UK callouts.
- Misfuel reference — the same material indexed under misfuel terminology.
- Scotland operations — callout coverage across all 32 Scottish council areas.
- Servicing — post-contamination servicing and inspection.
Background reading: DVSA. Service operated by Fuel Fixer, alongside Misfuel Doctor, Fuel Fixer Scotland and Motor Servicing.