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  Has anyone tested the mpg figures across different fuel brands? 21 Sep 2013 (Ask HJ)
  Assuming identical driving conditions, should similar miles-per-gallon be achieved no matter which fuel company's products are used? Have results been...
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  Fixing a 2005 Golf EPC warning light? 20 Apr 2013 (Ask HJ)
  I have a Golf Mk5 1.6 FSI 2005 model. The EPC light has come on permanently and it flashes when the engine is warm and the car is at idle. Had this...
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  Lumpy acceleration in a Subaru Forester 25 Jul 2012 (Ask HJ)
  I love my new Subaru but occasionally the acceleration feels stuttery, it's not smooth. Usually on the first acceleration of the day. I am careful not...
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  i30 or used Golf? 22 May 2012 (Ask HJ)
  I am weighing up whether to buy a 2nd hand (upto 2 year old) Golf 140 GT TDi (maybe Bluemotion Tech) or a new i30 1.6D 126hp Bluedrive (through Drive the...
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  Why is my Hyundai i10 so difficult to start? 25 Aug 2010 (Ask HJ)
  My Hyundai i10 is beginning to give me starting problems, intermittently. Its a March 2010 model with only 600 miles on the clock. I mainly do short runs...
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  How can I stop my Honda Civic hesitating under acceleration? 16 Jul 2010 (Ask HJ)
  I have recently bought a 2007 Honda Civic 1.8i ES, and have owned it for a week. I commute 40 miles a day to my workplace and, in an effort to keep fuel...
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  Can I try a premium fuel to improve my Vauxhall Astra's fuel economy? 7 Jul 2010 (Ask HJ)
  I drive a 2006 Astra 1.8 SRI with 49,000 miles on the clock. A few months ago, the onboard computer indicated a 15-20 per cent drop in economy. I checked...
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  Not getting through 20 Jun 2009 (Ask HJ)
  I have followed your suggestions on using Shell V Power fuel, high revs, and petrol cleaners (3 times). However I am still having problems as the engine...
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  My Audi A4 is suffering a DPF fault - what is causing it? 2 Apr 2012 (Ask HJ)
  I drive a three-year-old Audi A4 TDI and cover 85 miles each day to and from my place of work. My total annual mileage is roughly 28,000. On 5 November...
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  Poor fuel economy in a Mazda 6? 10 Dec 2015 (Ask HJ)
  Three weeks ago I bought a Mazda 6 2013 sport nav estate. It's a 2.2 175PS diesel auto. Overall I am very happy with the car. However I am a bit concerned...
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  Why does my ford Mondeo misfire? 26 Jan 2015 (Ask HJ)
  My 2001 Ford Mondeo 2.0 petrol has developed a misfire at around 1500 - 2000rpm. Any idea what the problem might be?
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  Standard vs premium petrol - which is best? 8 Feb 2016 (Ask HJ)
  I have followed your site for some time and have many a time heard the advantages of Premium diesel (or even branded diesel) over supermarket diesel. I...
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  Benefit of premium petrol? 8 Sep 2015 (Ask HJ)
  I have often seen your endorsement of 97 Octane fuel as worth the extra cost. I have owned from new my loved 2002 Honda Legend. Recently I had the chance...
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  Six months of apparent DPF problems with an Astra 3 Sep 2013 (Ask HJ)
  I have a 2012 Vauxhall Astra 1.7 diesel. It started to cut out in March 2013 and became unreliable. Vauxhall assistance (AA) said it was supermarket fuel....
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  What is causing this fault with our Volkswagen Golf Twincharger? 10 Aug 2013 (Ask HJ)
  I have a 2007 Volkswagen Golf GT Sport Twincharger 140 with 54,000 miles and full VW service history. Whilst travelling at 20mph for 4-5 miles on minor...
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  Can I run my 1991 Scirocco on super unleaded and fuel additives? 12 Jan 2013 (Ask HJ)
  I have a 1991 Volkswagen Scirocco GTll. At present I am filling my tank with Sainsbury's Super Unleaded and adding a Millers VSPe Power Plus fuel additive....
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  What vehicle can cope with towing and long distance travelling? 7 Feb 2024 (Ask HJ)
  We’re farmers and need to tow up to 2.5tons (trailer plus up to several cattle). The farm has a 4.0-litre diesel 2007 Range Rover Sport which has a number...
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  Win diesel 7 Mar 2009 (Ask HJ)
  You state that in lower temperatures diesels use more fuel. What is the thermodynamic basis for this statement? I find it difficult to figure out why...
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  Ford Mondeo refuses to turn over 6 Nov 2016 (Ask HJ)
  I have a 2000 Ford Mondeo petrol that has no spark, no crank and no petrol pump pulse. I've done a diagnostic test, but the computer box is also not receiving...
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  Rover 75 making a rattling noise 27 May 2014 (Ask HJ)
  I recently bought a 2002 Rover 75 diesel auto. After filling the car I noticed a ratting noise and the power steering stopped working. The alternator light...