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  Who’s fuelling who? 29 Dec 2012 (Ask HJ)
  I always find V-Power fuel to be really good on engine of all the fuels that I have used over the years. Does this mean using supermarket fuels result...
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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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  Is premium fuel worth it? 5 Feb 2012 (Ask HJ)
  I have recently bought a BMW 120i convertible (having reached that time of life!) and was wondering what difference Shell V-Power fuel would make as opposed...
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  Velocirapid 30 May 2009 (Ask HJ)
  I tried Shell V-Power to see if it made any difference to mpg, largely because of your newspaper column. I drove back to the UK from Frankfurt in my 1998...
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  Which is the best fuel for keeping my engine clean? 15 Sep 2012 (Ask HJ)
  Am I wasting money by occasionally purchasing Esso Supreme? I do this with the idea of it perhaps cleaning the engine and parts of my Mazda 5 Sport. I...
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  Winter fuel 29 May 2010 (Ask HJ)
  My regularly serviced 2005 1600cc Ford Focus automatic has never given a high mileage per gallon - usually about 28-31mpg for short and medium journeys...
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  Engine management light comes on 4 Feb 2012 (Ask HJ)
  I have a 03 Leon 1.4 petrol. Yesterday the engine warning light (Diagnosis/warning of excess pollution) came on. All the time, not flashing. There...
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  Tinkling noise from ix20 diesel 2 Jan 2012 (Ask HJ)
  I am very pleased with my ix20 disel - 4 months old. However very occasionally (and never at the dealers), the engine under load sounds as though it...
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  Temporary loss of power 28 Nov 2015 (Ask HJ)
  My BMW 116i has a temporary loss of power when accelerating in first and second gear (between around 1500rpm and 2000rpm). It feels as though the turbo...
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  DERV hurt 9 Oct 2011 (Ask HJ)
  I have recently purchased my first diesel car and have been informed that I should put the expensive diesel in from time to time as it is a cleaner fuel...
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  Do premium fuels de-coke turbochargers as well as injection components? 9 Sep 2010 (Ask HJ)
  This is a very important question as many vehicle owners suffer sticking vanes in turbochargers due to carbon build-up, which is very expensive to fix....
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  Thanks for recommending Shell V Power fuel - I use it in my 1996 Cadillac Deville. 9 Aug 2012 (Ask HJ)
  Having read a number of car articles in the Daily Telegraph (yes, some of us in the "Colonies" do read material from outside our borders), I noted your...
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  I stopped using premium fuel and got a huge dip in fuel economy - what do you think caused this? 5 Oct 2017 (Ask HJ)
  I have an Hyundai Ioniq, which I've run exclusively on Shell fuels for the 5000 miles that I've had it. I was getting 60-62 mpg on the regular stuff, then...
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  Which brand of premium petrol is best? 6 Jul 2020 (Ask HJ)
  Could you please advise which is the better petrol: Tesco 99RON or Shell’s 98RON?
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  Fuel and his money 9 Jan 2010 (Ask HJ)
  You may remember I wrote to you about starting and running problems with my recently purchased 2006/56 Focus 1.6 automatic. You recommended Shell V-Power...
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  Peugeot 308 SW anti-pollution warning light - what does it mean? 29 Nov 2016 (Ask HJ)
  I own a Peugeot 308 SW. Today the anti-pollution warning light has come on. Am I still able to drive the car?
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  Poor fuel economy after service 6 Jan 2016 (Ask HJ)
  My Vauxhall Zafira 1.7 diesel (13 reg) used to do about 45 miles to the gallon around town but after my last service it does only 38 miles to the gallon....
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  Would you recommend Terraclean performance tuning for my BMW 118d? 2 Nov 2013 (Ask HJ)
  I am considering trying Terraclean performance tuning on my BMW 118d, in the hope of improving emissions and improving performance by removing engine carbon...
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  Best fuels for Mondeos? 5 May 2013 (Ask HJ)
  I have a Mondeo Mk4 TDCI which has more than 110K miles on the clock. Although the majority of my driving is on the motorway, I’m conscious that I’m likely...