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  Why are the fuel injectors corroding on my Peugeot horsebox? 4 Jul 2017 (Ask HJ)
  I have a problem with my Peugeot Boxer horse box. It is four years old and has only done 6500 miles. To date, I have had to replace two fuel injectors...
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  Is a cold-start knocking in my Superb Estate the result of contaminated diesel or a failing DMF? 3 Aug 2013 (Ask HJ)
  Having given my local Skoda garage £370 to flush contaminated diesel from my Superb estate, a serious cold-start knocking issue persists as bad as ever,...
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  Starting problems with a van when warm - any ideas? 23 Mar 2013 (Ask HJ)
  I'm having trouble starting my van when the engine is warm. I've just had a new timing chain put on by my mechanic and since then I have this problem....
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  Which premium diesel fuels are the best for which types of driving? 2 Feb 2013 (Ask HJ)
  I have been reading with interest your advice on diesels having just taken delivery of my new company car a Mercedes-Benz E350 CDI. Like all diesels, it...
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  Ford Focus management light 2 Jan 2013 (Ask HJ)
  I own a 2003(53) Ford Focus TDCi, and over the past months - now and then even mid journey - it goes a bit sluggish, as if turbo not kicked in! Then lots...
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  Why has Shell's 'fuel saver' diesel increased my Chevrolet Cruze's consumption from 29.4mpg to 27.86mpg? 3 Apr 2011 (Ask HJ)
  I have now run a Chevrolet Cruze diesel auto for over one year. Since Shell introduced "Fuel saver" diesel, my consumption has increased to 27.86 mpg average...
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  You're wrong about the effect of coasting on fuel economy. 29 Aug 2010 (Ask HJ)
  Twice in the past year you have answered a similar question to 'is it economical to coast in neutral down hill'. Both times your answer is wrong! Of course...
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  Stupid fuel 15 Aug 2009 (Ask HJ)
  I recently did what appears to be what an ever increasing number of diesel fuelled cars owners are doing in that I filled my diesel Focus with petrol....
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  Was I missold a car because it's not getting the mpg I was told? 22 May 2020 (Ask HJ)
  What do the WLTP phases mean in real terms? Is the extra high phase just motorway driving? Basically, I bought a new Hyundai Kona 1.6 hybrid as I wanted...
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  Fuel contamination - how did it happen? 26 Oct 2013 (Ask HJ)
  I am totally mystified as to how my diesel Ford Mondeo got contaminated with petrol. Last week I filled up with diesel at my local supermarket and drove...
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  Which is cheaper to run, a hybrid or an EV? 22 Sep 2023 (Ask HJ)
  Which is the cheapest fuel cost, a hybrid doing 66 mpg or a full electric car?
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  Many years ago I purchased two jerry cans and filled them with diesel - is the fuel still okay to use? 15 Jul 2019 (Ask HJ)
  During the last fuel scare many years ago I purchased two jerry cans and filled them with diesel. The cans have not been opened. Is the diesel in them...
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  Will fuel stored in a metal cannister for two years still be okay to use? 5 Dec 2018 (Ask HJ)
  I keep 10 litres of unleaded petrol in an approved metal cannister in my car boot for emergency use. As I keep my tank topped up, the contents of the can...
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  What lead additive can you suggest for our 1977 MG Midget? 12 Feb 2018 (Ask HJ)
  We have a 1977 MG Midget owned from new with 45,000 miles on the clock. The engine is original and we've been using Castrol Valvemaster Plus additive....
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  Vauxhall Astra engine management light - what does it mean? 9 Nov 2016 (Ask HJ)
  I need to sell my 2006 Vauxhall Astra, but the engine management light stays on all the time. It was mentioned on the MoT advisory, but it passed anyway....
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  VAG EA189 emissions defeat software fix - seen this update? 29 Oct 2016 (Ask HJ)
  Have you seen this? The EU are worried about VW's fix. Reuters: EU fears VW diesel fixes could damage engines: Spiegel. http://google.com/newsstand/s/CBIwlYulmDA Keep...
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  Real MPG and real emissions 10 Oct 2016 (Ask HJ)
  Some friends are looking to change car soon. They are obsessed with emissions issues and look for low MPG cars with low carbon. Their current car (Smart)...
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  Peugeot Boxer fuel pump failure 8 Oct 2016 (Ask HJ)
  I need help with my Peugeot Boxer camper van. The vehicle is a 2008 model and has a full service history. In brief, the high pressure fuel pump has failed...
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  Which SUV is most economical? 2 May 2016 (Ask HJ)
  We currently have a 2015 automatic Mitsubishi L200. The fuel consumption is awful (max 30mpg). I do around 20,000 miles per year and would like something...
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  Panda Twinair - Are they fun to drive? 13 Apr 2016 (Ask HJ)
  I currently have a Fiat Panda 1.2 with 60PS and it's great, but I'm looking for a newer car. Having read all your reviews on small city cars, I've found...