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• budget 24 Jun 2010 (Forum)
  By how much will fuel and road tax go up by today?   I think 10%
• Does using cruise control worsen... 1 May 2007 (Forum)
  ... fuel consumption?
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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...
• Audi A6 2.7 tdi - Warranty - Petrol Contamination 24 Sep 2011 (Forum)
  At this point the car was taken to an Audi dealers who diagnosed petrol contamination in the diesel (requiring a filter and fuel change and fuel tank clean but...."This isn't under warranty as it's not a failure of the car! " It was interesting that when I tried the car out, it was extremely low on fuel and the salesman put a very small amount in whilst on the test.
• Any - Bio-diesel 3 Oct 2010 (Forum)
  He related an incident that he had recently  with his new diesel vehicle when refuelling at quote a major supermarket netwrok that sells its own brand fuel unquote.  They sell the new ultra-low-sulphur-diesel mandated by the EU for next year, including the bio-fuel proportion. His problem appeared to be that his car fuelling pipe kept blowing back and triggering the handpiece shut-off,  so he went back to the supplier and complained.
• Nissan Primera III (1999 - 2002) - 01 2.0 Fuel economy has nose dived - ideas? 18 Jan 2009 (Forum)
  Obviously sounds likely to be some kind of air leak in vacuum, egr or induction system but could this be causing the fuel consumption problem? It's due a full service of air, fuel filters, spark plugs, oil etc possibly HT leads and I will investigate the hissing noise. The distributor cap and rotor arm were replaced 6 months ago.
• FIAT Punto II (1999 - 2006) - 1.9D, the old smoker, quits in time for MOT.. 4 Jun 2008 (Forum)
  Put it in for MOT this AM and it was massively under the max smoke limit. Questioning SWMBO, she has switched garages last year, now filling up with a different fuel near her work instead of the well known (also) major fuel brand (normal derv, not extra priced) we have have used for years. That`s a real shocker as I don`t believe in any of this, or fuel additives but that`s the only variable from previous years.
• Why the huge jump in diesel performance 22 Jul 2004 (Forum)
  Mods - feel free to move to the Technical forum if you wish, but to me this was more a Discussion item. In simple terms, add some electronic gubbins, whack up the turbo boost, wind up the fuel injection pressure to some giddy value, and hey presto you have a high performance diesel that'll tow the QE2 from 30-70 in no time flat, stay there all day, and use an egg cup of fuel in the process.
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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...