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  Thanks for presenting your true mpg figure database, and don't blame the manufacturers for trying. 16 Jun 2011 (Ask HJ)
  Congratulations on launching a table to reflect true average fuel consumption figures (www.honestjohn.co.uk/realmpg). You cannot really blame the manufacturers....
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  Real life fuel economy register 8 Jun 2011 (Ask HJ)
  I filled out the real life figures for my Honda Jazz 1.2 in April /May. My figures were included and gave my true readings. However the site has taken...
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  Rip off Britain? 11 Feb 2011 (Ask HJ)
  I have just returned from Tenerife, a Spanish island in the Atlantic, miles from anywhere. Diesel fuel is 0.844 cents per litre or about £0.75 pence per...
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  Air flow meter 10 Feb 2011 (Ask HJ)
  Just brought a new air flow meter off ebay, was £32 and works fine, but think my fuel economy has gone down. I am getting at best 300 miles for a tank...
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  Our new Fiat Panda automatic has returned an excellent 55mpg average over 5000 miles. 14 Oct 2010 (Ask HJ)
  We recently swapped our old Rover 45 1600 auto for a FIAT Panda Automatic. We're really pleased with it - particularly the fuel consumption. We've always...
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  Vauxhall Zafira 2 Oct 2010 (Ask HJ)
  my Zafira has been playing up for a while now when its low on fuel in looses power only on a left turn. However it's been in 5 garages now and they haven't...
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  Why doesn't my new Opel Astra doesn't achieve the quoted fuel economy figures? 10 Sep 2010 (Ask HJ)
  My new Opel Astra 1.7CDTI SE (110) is still heavy on diesel with over 13,000km on the clock. The manufacturer quotes circa 61mpg, whereas I am lucky...
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  My Ford Mondeo screeches under acceleration - why? 16 Aug 2010 (Ask HJ)
  I have a Ford Mondeo 2-litre TDCi. I put some V-Power fuel in it last week and it started belching out black smoke and misfiring more than usual. On further...
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  Why is my Volkswagen Passat producing smoke, oil and water from the exhaust? 30 Jul 2010 (Ask HJ)
  My Volkswagen Passat 1.9TDI 130 Sport is throwing out white smoke, oil and water. Have you any ideas? Can I try injector cleaner?
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  Something in particulate 12 Mar 2010 (Ask HJ)
  Just recently (in this cold weather) I have had great difficulty starting my Skoda Octavia 1.9 TDI. When it eventually has started a cloud of back particulates...
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  Sulph-righteous 3 Jan 2009 (Ask HJ)
  I recently purchased a newish brand of diesel fuel here in France. It stated on the pump that it was sulphur-free. The price was a few centimes more expensive...
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  is it possible to convert a Dacia Sandero to LPG? 3 Sep 2022 (Ask HJ)
  Can you tell me if it's possible to convert a petrol Dacia Sandero to LPG?
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  Why won't my Zafira start? 20 Feb 2015 (Ask HJ)
  My 2003 Vauxhall Zafira diesel won't start. It hasn't suffered from this problem before and was only standing for a day. Any ideas?
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  What fuel economy does the Vauxhall Insignia return? 25 Aug 2010 (Ask HJ)
  Do you know what the MPG is on a Vauxhall Isignia 2.0CDTI Exclusiv?
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  Faulty car - what are our rights? 18 Jul 2016 (Ask HJ)
  I recently purchased a used (2008 model) BMW 1 Series. When driving it home from the dealer the engine management light came on. I looked in the car's...
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  Misfueling petrol into a diesel 13 Jul 2013 (Ask HJ)
  I recently filled the tank of my diesel Mercedes-Benz E-Class with petrol. Although there are no legal requirements, I feel Sainsbury's garage owe me some...
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  Do I need an E5 additive for my classic Daimler? 4 Aug 2023 (Ask HJ)
  I am fortunate to have and look after a 1969 Daimler Sovereign (420). I am having to use E5 fuel and would appreciate your guidance on which additive(s)...
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  Should I let my car idle before switching it off? 16 Jul 2020 (Ask HJ)
  My daughter is waiting to collect a used 2017 Kia Sportage from a Kia dealership. Your articles have often recommend drivers using Shell V power fuel....
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  How should I store my classic in the winter? 19 Dec 2018 (Ask HJ)
  How should I store my car in the winter? I can't drive on roads because of salt and I'm not sure if it's a good idea to start the car every two months...
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  What do you think about the new generation of diesel engines which use reduced compression ratio to improve fuel consumption? 23 Nov 2013 (Ask HJ)
  There is an article in a recent ‘Economist’ magazine on a new generation of diesel engines. These apparently achieve better fuel consumption by reducing...