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  Will premium diesel make my DPF last longer? 27 Sep 2016 (Ask HJ)
  You frequently advocate the use of Shell V-Power Nitro Diesel which I have used in my Citroen C5 from new. You also state that diesel engines are prone...
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  Why does my classic cut out on the motorway? 30 Jul 2014 (Ask HJ)
  I am the proud owner of a 20 year old Audi 100. It has done 98,000 miles and is well maintained. Over the past three years the engine has cut out on the...
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  Winter driving - car won't start 12 Nov 2013 (Ask HJ)
  I have a 13 year old Audi A6 Allroad, which I use in the Alps in the winter. However, I’ve noticed that the car runs very poorly in cold weather and sometimes...
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  Which small car offers good fuel economy? 16 Mar 2013 (Ask HJ)
  My wife has a Vauxhall Meriva 1.6 Club which is three years old in August and has done about 15,000 miles. It cost just under £9000 new as it was the last...
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  Is Shell monopolising fuel stations in certain areas? 22 Dec 2012 (Ask HJ)
  I wonder if it's been noticed that Shell has recently bought virtually all the other petrol stations in the Camberley area. We had an Esso, a Texaco and...
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  Audi A6 Particulate Filter warning light 17 Dec 2012 (Ask HJ)
  The particulate filter warning light came on two days ago. I read the manual which suggested running the car in fourth or fifth above 2000rpm for 15 minutes...
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  Do all the electrical accessories in modern cars increase fuel consumption? 24 Nov 2012 (Ask HJ)
  There seems to be an ever-growing number of electrically-powered devices in cars: digital instruments, heaters, fans, air conditioners, ever more powerful...
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  Is this fuel economy normal 7 Sep 2012 (Ask HJ)
  I bought a 2006 Mondeo TDCI. It's running perfectly and has just had a major service. I'm only achieving just over 120 miles per 1/4 tank and thats on...
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  Carens start up issues? 23 Jul 2012 (Ask HJ)
  I have a Kia Carens on an 06 plate, and very good it is. It has an intermittent and very odd starting problem, where it starts fine but will not rev. Once...
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  Real life Micra DIG-S Consumption 22 Jul 2011 (Ask HJ)
  You recently test drove the Nissan Micra DIG-S. You were quite positive about the new supercharged engine and it's claimed 69mpg combined fuel consumption....
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  Angels of Murcia 23 Jun 2011 (Ask HJ)
  After arriving at Murcia airport recently for a family holiday to La Manga I was shocked to discover that the hire car company would charge me 100 Euros...
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  Used cars with low fuel consumption 6 May 2011 (Ask HJ)
  We have owned a 1989 Volvo 740 estate from new and now want to buy a relatively new used car (or a very low priced new car) to replace it. The new car...
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  Jazz blues 7 Mar 2009 (Ask HJ)
  In terms of fault occurrence, my Jazz is the most unreliable car I have ever owned. After a few hundred miles, the fuel consumption worsens by 10mpg or...
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  How do you compare the fuel economies and efficiencies of electric versus petrol/diesel cars? 26 Apr 2021 (Ask HJ)
  With the coming of electric vehicles, wouldn’t it be better to start referring to all vehicles economy as MP£ or Miles per Euro as standard rather than...
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  Purchasing diesel abroad 31 Aug 2011 (Ask HJ)
  Using premium fuel (Shell V-Power) seems to be the only way to avoid particle filter problems with AUDI A3 in the UK. What grade Diesel do I need to...
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  How is the MPG for PHEVs calculated? 4 Oct 2024 (Ask HJ)
  How are the figures calculated for a Lexus NX 450 PHEV - that has a published mpg of 256.7mpg?
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  Will the emissions fix undo my Audi remap? 18 Mar 2017 (Ask HJ)
  My diesel Audi 2.0-litre has been remapped. Will the emissions fix undo my remap, thus meaning I will have to pay to get it done again?
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  Where should DPFs be mounted? 1 Mar 2015 (Ask HJ)
  Are there any diesel engines where the regen fuel is not injected directly into the engine on the exhaust stroke? To my mind a DPF should ideally be as...
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  My fuel consumption is down - why? 19 Jan 2015 (Ask HJ)
  I have a 3 month old Mondeo (TDCi 163) - on taking delivery the tank was empty and had to fill up with standard Jet diesel at the nearest garage - this...
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  How can I improve the fuel economy of a Ford Focus? 30 Oct 2014 (Ask HJ)
  My sister’s 2005 Ford Focus 1.6 is getting very poor fuel economy, about 24mpg on short trips and about 29mpg on long trips. I have fitted new plugs, air...