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  Jaguar XJ - X350 - petrol or diesel? 24 Apr 2016 (Ask HJ)
  Thinking of buying Jaguar XJ - X350 model. I drive about 250 miles per week, and wondered if the diesel made sense, or if the 3.0-litre V6 would be more...
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  Buying an new Audi A1 Sportback - petrol or diesel? 1 Apr 2015 (Ask HJ)
  I am in the process of buying a new Audi A1 Sportback, but I cannot decide between the 1.0-litre 95PS petrol or the 1.6-litre 116PS diesel. The diesel...
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  Ford Mondeo estate - Petrol or diesel? 9 Mar 2015 (Ask HJ)
  My son wants to buy a Ford Mondeo estate. It would be a 3 year old car and he would hope to keep it for around 6 years. He does about 25K per year and...
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  What petrol gives the best MPG? 7 Nov 2022 (Ask HJ)
  Do you know of any research comparing the mpg obtainable from different fuel brands? My local fuel garage has changed to a lesser-known brand and I feel...
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  Which engine should I choose for high motorway mileage? 3 Oct 2022 (Ask HJ)
  I travel more than 20,000 miles per annum on a motorway. What is a GDI engine? How does it compare to other 1.4 i20s and diesel CRDi for fuel economy...
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  Which petrol family car returns the best economy? 6 May 2015 (Ask HJ)
  I would like to buy a new or nearly new petrol family estate or SUV - probably either a Volvo (V70 or V60) or Audi (A4 or Q5)- but all the good buys (and...
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  In diesel exposure 29 Aug 2011 (Ask HJ)
  I have a 2009 Mercedes ML 320CDI still under warranty. If I leave it for over a day, when I come to start, it misfires very badly. When it does start,...
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  Audi TT purchase 2 Jul 2011 (Ask HJ)
  I am looking to purchase a 2009 or 2010 Audi TT 2.0 coupe but do i go for the petrol or diesel version, I do approx 15k miles per year and do i go for...
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  Buying a Skoda Yeti - petrol or diesel? 29 May 2014 (Ask HJ)
  I want to buy a new Skoda Yeti but cannot decide if I should get a petrol or diesel. I do 15,000 miles per year; consisting of one or two monthly trips...
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  I put petrol in my diesel van, which was already half full of diesel - what should I do? 30 Oct 2017 (Ask HJ)
  If my van was half full of diesel and I filled it with petrol, would it run for a week?
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  Vauxhall Corsa diesel problems 4 Jul 2016 (Ask HJ)
  I have a 2004 Vauxhall Corsa 1.3 diesel that i'm a bit worried about. The car suffers from occasional stutter on acceleration in second and third gears....
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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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  Non starter 24 Jan 2009 (Ask HJ)
  Very recently I read a piece in your column about a car that "shut down" and simply wouldn’t start when the owner tried to move it within his drive. If...
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  Mazda 6 vs Volvo S60 20 Jul 2016 (Ask HJ)
  We are considering buying a new car and have narrowed our choices to a diesel Mazda 6 and a S60 Volvo diesel. However we are concerned about reports that...
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  Is my Fiat 500 Multijet suffering from a DPF fault? 21 Dec 2013 (Ask HJ)
  I purchased my Fiat 500 diesel Multijet in April this year. It's about five years old. According to the service history, the oil was changed in October...
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  Could you do a long range economy test on a hybrid vs a modern diesel? 17 Nov 2012 (Ask HJ)
  I love diesels as they suit the terrain here in southern Spain; lots of steep hills where you do not need to change to a lower gear to easily get up them,...
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  My Jaguar XF returns 40-41mpg which is close to the official figure of 42mpg. 28 May 2011 (Ask HJ)
  Some manufacturers seem to manage to make their cars deliver closer to the official fuel figures than others. As the owner of a Jaguar XF diesel I get...
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  Should I buy a diesel when I only do 5000 miles a year? 18 Jul 2023 (Ask HJ)
  I am looking for a car, preferably diesel and automatic but essential it is comfortable. My budget is under £20K what would you advise. My annual mileage...
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  Is there anything, other than long runs, that can clean a DPF? 2 Feb 2017 (Ask HJ)
  What year were DPFs introduced by Ford and Vauxhall. Also is there anything out there that can really clean them, apart from long drives?
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  Buying a new car - petrol or diesel? 15 May 2016 (Ask HJ)
  I want to buy a new car. I cannot decide between the Skoda Octavia 1.6 TDI or the Suzuki Vitara 1.6 petrol. The Suzuki has more equipment for less money,...