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  Do some fuel pumps dispense less fuel than they say? 6 Apr 2013 (Ask HJ)
  I recently filled my car with petrol, and as I replaced the pump noticed the display read 46.5 litres. I was sure my tank only holds 45 and it hadn't been...
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  Benefits of upgrading my carburettor 17 Dec 2012 (Ask HJ)
  I recently purchased a B reg Mercedes-Benz 190 2.0-litre carburetter model with only 26,000 genuine miles and have since done another 15,000. Everything...
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  How should I drive my car to benefit from using Shell V-Power fuel? 17 Nov 2012 (Ask HJ)
  I’ve taken your advice on Shell V-Power fuel but I would like to clarify a few other factors. My car has only done 40,000 miles and, even for the age,...
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  Can I clarify how biofuels are processed? 28 Apr 2012 (Ask HJ)
  I read your explanation regarding the emulisification of biofuels and think you have mixed up the two major fuel types: Bioethanol (ethanol from a biological...
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  Can a petrol pump temporarily malfunction and provide the wrong fuel? 12 Jan 2012 (Ask HJ)
  Some 18 months ago I filled my car at my usual Tesco petrol filling station using the diesel pump and getting a receipt for diesel. After about 800 yards...
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  Can I alter my 2002 Ford Ranger's wheels and/or gearing for better fuel economy when cruising? 22 Oct 2010 (Ask HJ)
  I own a 2002 Ford Ranger pick-up and use it for work and pleasure. I have noticed that on a motorway run, at 70mph it is running at just over 3,000rpm....
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  How can I tell whether my Mitsubishi Chariot has a piston or ring problem? 7 Jul 2010 (Ask HJ)
  I have a Mitsubishi Chariot 1996 2.0 auto and would like to know how I can tell if I have a piston or ring problem. The last thing I want is to take the...
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  I had no idea how much low tyre pressures can affect fuel economy. 30 Jun 2010 (Ask HJ)
  Seven weeks and 3000 miles after I took delivery of a new Skoda Octavia Scout 1.8 TSI I decided to check my tyre pressures. They were all too low by about...
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  No particulate place to go 22 May 2010 (Ask HJ)
  I've read with some dismay of the shocking stories of Mazda 2.0 diesels spewing fuel into the engine lubricant with understandable and catastrophic results....
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  Is a loss of power in my Audi A3 a symptom of the emissions fix? 15 Mar 2017 (Ask HJ)
  Since my Audi A3 had it's emissions fix it has had problems with the engine management system light flashing intermittently and the engine losing power....
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  Shell V Power Nitro+ 28 Jan 2016 (Ask HJ)
  Hi John, I've enjoyed your website and insight on matters motoring for some time; we occassionally differ (I love my DSG gearbox for example) but its...
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  What could be causing a fuel gauge fault in my Volkswagen Polo? 21 Dec 2013 (Ask HJ)
  I would be grateful for your comments regarding the "niggles" I'm having with my 2011 Volkswagen Polo 1.4 Match. On one occasion in July I turned on my...
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  Why is my wife's new A Class Mercedes-Benz returning fuel economy 25 per cent below the advertised figures? 28 May 2011 (Ask HJ)
  I bought a new Mercedes-Benz A160 Blue Efficiency model for my wife's use a year ago. From the outset it was obvious the fuel economy was going to be nowhere...
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  Engine problems with T25 camper van - what's the cause? 17 Sep 2013 (Ask HJ)
  I’m having some problems with my Volkswagen T25 camper van. It has started misfiring and losing power; the RAC cleaned the jets and things improved, but...
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  BMW X1 Efficient Dynamics fuel consumption 12 May 2012 (Ask HJ)
  I have a BMW X1 2.0 diesel manual efficient dynamics model I have recently bought from a dealer. The official combined fuel consumption figure is 62.8...
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  Most fuel efficient used car under £20,000? 24 Oct 2022 (Ask HJ)
  What are the best used cars for fuel economy for less than £20,000?
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  Best diesel for Jaguar F-Pace? 5 Oct 2016 (Ask HJ)
  I have a new Jaguar F-Pace. Is it worth buying branded diesel,rather than supermarket fuel? If so is premium worth the extra?
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  Should I use supermarket petrol? 9 Apr 2014 (Ask HJ)
  Should I use cheap supermarket petrol or better quality branded fuel?
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  Toyota RAV4 diesel pump - has it died? 13 Dec 2012 (Ask HJ)
  I have a 2005 Toyota RAV4 diesel with 57,000 miles on the clock. It was running fine, but now won't start. We've been told that it's probably the diesel...
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  What steps do I need to take in recommissioning a car that's been standing for 18 years? 16 May 2019 (Ask HJ)
  A friend has asked by advice on returning their 1992 Sierra Sapphire Cosworth 4WD back to roadworthy condition. It is in immaculate original condition...