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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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  Which cars can use super ethanol (E85) fuel? 2 Aug 2022 (Ask HJ)
  There is an increase at the pumps in France of super ethanol. Which UK purchased cars can use it?
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  Air conditioning and fuel consumption 24 Feb 2014 (Ask HJ)
  Your recommendation is to use air con regularly to avoid dry seals but my car manual recommends leaving air con on to enable the climate control system...
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  Fuel consumption worse after using premium fuel. 1 Jul 2012 (Ask HJ)
  A few months back I persuaded my wife that it was good practice and worthwhile to fill the Nissan X-Trail with higher quality diesel, as although it was...
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  Diesel injector problems with a Peugeot Expert 14 Mar 2012 (Ask HJ)
  I recently changed the fuel filter on my Peugeot Expert 1.9[non turbo] 03 van. It has a lucas injector pump and the filter housing has the zip tie type...
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  Mike and Burny winter 10 Jan 2009 (Ask HJ)
  I took delivery of a new Audi A4 Avant 2.0 litre 143 manual TDI in August and having now covered more than 5,000 miles I am disappointed with the fuel...
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  Can I run my car on E10 fuel? 19 May 2023 (Ask HJ)
  I have a 2011 Volkswagen Touran imported from Japan. It has a 1.4 petrol engine. Do I need to run it on premium petrol or is supermarket E10 okay?
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  V-Power in a hybrid? 30 Jan 2012 (Ask HJ)
  Should I run my new Prius 10th Anniversary on Shell V-Power? I'm hoping to get even better fuel economy to offset the additional cost at the pump.
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  Is premium diesel worth the extra cost? 23 Feb 2011 (Ask HJ)
  Is it worth using a premium diesel fuel in a 2007 VW Passat 2.0 TDI car from the point of view of performance, engine longevity, smoother running etc?
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  Should I use a premium fuel in my Honda Civic Hybrid? 1 Aug 2010 (Ask HJ)
  I have a Honda Civic Hybrid (07). Do you think using a more expensive petrol would be better for my car than normal fuel?
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  What are the benefits of Shell V-Power diesel? 17 Oct 2024 (Ask HJ)
  What are the benefits of V Power diesel?
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  Do you recommend fuel additives for petrol engines? 9 Feb 2022 (Ask HJ)
  Do you recommend Redex additive for petrol engines?
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  I made a stupid mistake and put the wrong fuel in my car. What should I do? 9 May 2021 (Ask HJ)
  I filled my diesel Nissan Qashqai with petrol. What’s the best course of action?
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  How much of the fuel efficiency of a 2016 Prius Plus would you say is due to different elements? 2 Oct 2016 (Ask HJ)
  How much of the fuel efficiency of a 2016 Prius Plus would you say is due to the different elements of (1) the Atkinson cycle CVT engine (2) hybrid battery...
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  What MPV would you recommend? 14 Jun 2015 (Ask HJ)
  I like to sit up high in a new car following hip problems, comfort and fuel consumption is important to me. Does one get better fuel consumption from manual...
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  Large 4x4 best fuel tank range 9 May 2015 (Ask HJ)
  Commute a round trip of 200 miles per day on a free flowing motorway. Need a large 4x4 with a big fuel tank range. Have £15k to 18k to spend. What is recommended?
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  Pump doesn't stop automatically when filling up 14 Dec 2012 (Ask HJ)
  When you insert the nozzle and fill the tank, the pump doesn't automatically stop it just fills the tank and then floods the forecourt with petrol. What...
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  Can new tyres affect my fuel economy? 3 Oct 2012 (Ask HJ)
  I drive an Audi A3 1.6TDI, driving 20,000 per year with fuel economy on motorways between 58mpg and 64mpg depending on weather, temperature and traffic...
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  Why has my Audi A4's fuel tank contracted? 4 Jul 2012 (Ask HJ)
  I have just had my Audi A4 serviced and the mechanic tells me that the diesel tank is curved inwards on the bottom underside as if it has been sucked in....
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  Have supermarket fuels improved? 13 Jun 2012 (Ask HJ)
  I subscribe to 'What Car'. The latest (July) edition has an impressive ad by Tesco singing the praises of the quality of their fuels, and I do note that...