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  Are there any long term problems with direct fuel injection engines over port injection engines? 20 Jul 2018 (Ask HJ)
  Are there any long term problems with direct fuel injection engines over the port injection engines type? Particularly with Subaru's Impreza?
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  Why does my Audi A4 have poor fuel economy following the emissions upgrade? 22 Mar 2017 (Ask HJ)
  Has anybody else had a reduction in their fuel economy following the recent emissions upgrade? The range on my Audi A4 has gone from 620 to 570 miles per...
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  Why is fuel economy so awful for autos? 5 Dec 2014 (Ask HJ)
  Why is fuel consumptions so bad in automatics, compared to the manual versions? It appears to be worse with Kia/Hyundai/Ford, most with dual clutch boxes....
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  Which is the best fuel for keeping my engine clean? 15 Sep 2012 (Ask HJ)
  Am I wasting money by occasionally purchasing Esso Supreme? I do this with the idea of it perhaps cleaning the engine and parts of my Mazda 5 Sport. I...
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  Fuel gauge fault on Polo 14 Dec 2015 (Ask HJ)
  I have a 1996 Volkswagen Polo 1.4 petrol and my fuel gauge is fluctuating between full and empty tank. Is this problem common and can I fix it myself?
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  Differences in fuel (diesel) quality and so impact on fuel consumption 12 Jul 2013 (Ask HJ)
  HI. I have been running a Mini Cooper SD Coupe (2102 with 2k to 7k miles) for the past 5 months. I have alternated the use of 6 fuels to see if any brand...
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  Fuel rail problem with my X-Type 26 May 2012 (Ask HJ)
  My X-Type broke down on motorway. The glow plug light on the dash started to flash, the engine management light came on and the car cut out. It had to...
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  Diagnosing poor fuel consumption 6 Feb 2012 (Ask HJ)
  I am experiencing very low fuel returns on my 2006 Ford Focus 1.8 TDCi Ghia of around 28 miles per gallon. The large rubber hose that connects to rear...
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  How accurate is the fuel gauge in my Toyota Auris Hybrid? 16 Nov 2013 (Ask HJ)
  I have a 2010 Toyota Auris Hybrid T-Spirit and have a query about the fuel gauge. The ‘Optitron’ fuel gauge has 10 blocks on it which, when it gets to...
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  Did biofuel cause my Citroen DS3 to break down? 4 May 2013 (Ask HJ)
  My 8-month-old Citroen DS3 e-HDI 110 stopped at the side of the road with the engine management light on after I had lost all power and the car refused...
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  Is this a legitimate way to buy cheap diesel? 3 Apr 2011 (Ask HJ)
  I think I have discovered a legal way to buy cheap diesel fuel. My work colleague buys diesel from a truck breakers yard in Surrey and gets it for about...
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  I get black smoke when accelerating - what's wrong? 9 Aug 2023 (Ask HJ)
  I have a 2016 Peugeot Boxer 2.0 HDi and get black smoke under acceleration plus the engine light comes on?
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  Should I use premium diesel for a Volvo V60? 18 Aug 2022 (Ask HJ)
  I have a 2017 Volvo V60 D3 2.0-litre diesel. I am just wondering (given this is not a performance car) if there is any point paying the 10 per cent-plus...
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  Does my Toyota C-HR need premium oil and fuel system cleaner? 4 Jan 2022 (Ask HJ)
  I've booked my 2019 petrol Toyota C-HR in for a 60,000-mile service and have been quoted an extra £40 for them to use premium oil and a fuel system cleaner....
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  Can I keep a low fuel level in a hybrid? 30 Jul 2020 (Ask HJ)
  I recently bought a Volkswagen Passat GTE. My local commute is only 10 miles round trip so I'm running almost exclusively on electricity except if I make...
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  What will be the effect of more ethanol on fuel? 26 Feb 2020 (Ask HJ)
  Currently, most petrol sold in the UK is E5 i.e 5% ethanol. I understand that the Government is considering increasing this to 10%. What would the effect...
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  Volkswagen claims it will buy back cars affected by emissions scandal? 17 Nov 2015 (Ask HJ)
  It is reported that Volkswagen will buy back cars where the CO2 in "correct" testing is 10% or more different to the published values. Does it mean therefore...
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  Fiesta fault 7 Aug 2015 (Ask HJ)
  My 1998 Fiesta Zetec only has 33k miles but has started dying while driving. It randomly starts and then doesn't start, so can't be trusted. I recently...
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  Why is the fuel gauge in my Vauxhall Zafira not accurate? 7 Dec 2013 (Ask HJ)
  I recently bought a 2006 Zafira 1.6, fully serviced. It idles perfectly and runs smoothly. I filled half a tank and at the first notch on the gauge it...
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  Repairing old fuel tanks 30 May 2013 (Ask HJ)
  I read the question in your Telegraph column (from ND in Lincolnshire) about a Mitsubishi Sigma fuel tank that's leaking. You advised finding a plastic...