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  Is it worth using an additive in my diesel? 16 Aug 2010 (Ask HJ)
  Do you think diesel additive is worth buying and using? Or would it be better to buy the premium fuel on the forecourts?
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  My EV is off the road and I've been given a petrol car, can I claim fuel costs? 12 Apr 2022 (Ask HJ)
  My electric vehicle has been involved in a no fault accident. I've been given a petrol equivalent but get just 30mpg. I've asked for an EV instead as I...
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  Can you recommend an SUV with good fuel economy? 31 Jan 2022 (Ask HJ)
  I am looking for a good sized SUV with strong mpg. I really like the Hyundai Tucson but the 35mpg puts me off. As I am only doing daily short trips I'm...
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  I plan on storing my car for six months of the year - what can I do to avoid any problems? 3 Apr 2019 (Ask HJ)
  I am intending to keep my 2005 Toyota Celica in storage. Occasionally using it every summer which means six months+ without use from time to time. What...
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  I'm storing my classic car for six months, should I leave petrol in the tank? 21 Aug 2018 (Ask HJ)
  I will put my classic car into my garage with a fitted cover in October for six months. Would it be best to fill the tank up with petrol to stop the condensation...
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  Is buying a used LPG van, or new that needs converted, a good idea for fuel economy? 3 Jul 2018 (Ask HJ)
  I drive 200 miles once a week from London to Devon and need to buy a van (used or new) that's smaller than a Citroen Dispatch. I have two children so it...
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  Can I get a remap to improve the fuel economy of my Kia Cee'd? 9 May 2017 (Ask HJ)
  Based on your advice and all you've written, I bought a Kia C'eed estate auto 1.6 diesel (no DPF) with 37,000 miles on the clock from a Kia dealer this...
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  Will using premium fuel and driving gently improve the life of the EGR, DPF and injectors? 3 Apr 2017 (Ask HJ)
  The emissions fix was done on my 2010 Volkswagen Golf 1.6 TDI in January 2017 and it now drives very differently. The DSG gearbox changes up into seventh...
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  Should I get another diesel car? 10 Mar 2017 (Ask HJ)
  I drive about 25,000 miles a year on motorways and country roads for my job and need a reasonable sized vehicle to carry equipment plus a 4x4 capability,...
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  Sudden decrease in fuel consumption 9 Jul 2016 (Ask HJ)
  Back in March 2015 I asked you: "I bought a 2012 Honda Civic 1.8 EX i-VTEC in February, swapping it for my 2006 2.2i-CTDi. The overwhelming 'feature'...
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  Leaving car unused for three weeks 14 Dec 2015 (Ask HJ)
  I will be away for three weeks over Christmas and New Year and will be leaving my car unused. I do not have a closed garage and therefore, it will be parked...
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  Increasing oil levels - what's the fault? 14 Nov 2014 (Ask HJ)
  The oil level in my 2009 Ford Focus 1.6 diesel is increasing and I have to change the oil every two weeks to save the engine. The coolant level doesn't...
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  Do you have any idea what is causing an engine fault on my Renault Scenic? 3 Aug 2013 (Ask HJ)
  My Renault Scenic 1.9 DCi recently cut out when being driven out of the local supermarket car park. It could not be re-started and the AA was summoned....
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  As a petrochemist I concur with your comments on the effects of driving habits on DPFs and EGR valves. 27 Jul 2013 (Ask HJ)
  As a petrochemist specialising in engine lubrication I have to agree with your comments entirely. It's not commonly known that driving habits have an effect...
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  Warranty 4 Apr 2013 (Ask HJ)
  When I bought the Evoque the salesman made much of a failsafe device in the fuel filler neck which would prevent misfuelling. Filled diesel car with petrol...
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  Premium fuel solved a stalling problem on our i30. 2 Mar 2013 (Ask HJ)
  I own a 2009 Hyundai i30 petrol 1.6 Estate (manual) bought from a Hyundai dealership in 2010. This car has been a likeable, reliable car to drive over...
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  Non-starting Volkswagen - can you help? 26 Nov 2012 (Ask HJ)
  My son's 53-plate Volkswagen Polo 1.4-litre petrol will not start. He tells me he has been having trouble for the past three weeks. The engine was turning...
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  X-Trail fuelling issues 24 Sep 2012 (Ask HJ)
  I wrote recently, and thank you for the reply, about my 2011 X-trail and the "flatness" around 2000rpm. My dealer says they all do it, something which...
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  How has my company car tax worked? 22 Jul 2012 (Ask HJ)
  With all the confusion around company car tax could you clarify the tax allowance for emergency services lease cars for those of us who respond to incidents....
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  Fuel consumption tests 3 May 2012 (Ask HJ)
  I'm glad to see the DT taking up the cause for improving the completely unrealistic 'Official' consumption figures. As you say, manufacturers are simply...