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  Why does my hybrid give better economy in the summer? 12 Apr 2023 (Ask HJ)
  My Yaris Hybrid can touch 80mpg in summer but drops down to about 60mpg in winter. Any reason for that?
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  Didn't realise I put petrol in my diesel car until it started stuttering. Is it badly damaged? 26 May 2020 (Ask HJ)
  I've just put petrol into my diesel car. I didn't realise and drove it for about three mins. I only realised when it started stuttering. The car would...
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  I can't collect my new car until lockdown ends - should I ask the dealer to replace the battery? 21 Apr 2020 (Ask HJ)
  Two or three days before Covid-19 struck, I put a deposit on a three-year old Skoda Fabia Estate, which had been off the road since the end of January....
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  Does active regeneration of the DPF happen automatically? 7 Nov 2019 (Ask HJ)
  Does active regeneration of the DPF happen automatically? And should I put additives into the fuel?
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  Why are PHEVs less efficient than normal hybrids? 16 Nov 2018 (Ask HJ)
  I have read your report about poor real life mpg for plug-in hybrids if not plugged in. Why are they less efficient than conventional hybrids if used in...
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  I do over 20,000 miles per year - should I buy an SUV? 31 Mar 2017 (Ask HJ)
  I'm thinking of purchasing an SUV, or similar to replace my Saab 9-3. I have narrowed it down to Kia, Honda, Ford and Nissan. I'm tempted by the Kia Niro....
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  Why is my Renault Laguna intermittently losing power? 4 Jan 2017 (Ask HJ)
  I have a petrol 2005 Renault Laguna 2.0, the engine runs like a dream but sometimes when you are driving along there will huge loss of power for a few...
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  Can petrol pumps give short measures? 19 Nov 2015 (Ask HJ)
  I filled up with Shell V power at my local filling station today. Previously I have never been able to get more than 42 litres of fuel in, today it took...
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  Petrol Honda CR-V on urban commute - worth using premium fuel? 28 Oct 2015 (Ask HJ)
  I drive a 2013 4WD Honda CR-V, with a 2.0 litre petrol engine (manual). My daily commute is 7 miles each way in urban / suburban traffic. I drive carefully...
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  Toyota Aygo sudden loss of power 29 Jul 2015 (Ask HJ)
  I have a 2006 Toyota Aygo diesel but recently a couple of times I have had a quick sudden loss of power as if something is slipping or cutting out. It...
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  What's the cause of my car's falling fuel economy? 19 Apr 2015 (Ask HJ)
  My wife's Toyota Yaris diesel (2011 model) has been averaging around 60mpg since we bought it at 40,000 miles/two years ago. The car has now done nearly...
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  New Car Fuel Economy - will it ever improve? 18 Dec 2014 (Ask HJ)
  I have a 2014 Skoda Superb Estate 2.0 TDI CR 170PS DSG, which I took delivery of in September 2014. Since then I have clocked up over 7000 miles and have...
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  Clogged up C-MAX 30 Oct 2013 (Ask HJ)
  My C-MAX, 11 Reg, 21,000 miles has gone into Limp Mode on a number of occasions. It is in warranty and serviced by Ford Agents since new. The local agent...
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  Where's the best place to hire a car in Thailand? 23 Oct 2013 (Ask HJ)
  Can you offer any advice regarding car hire in Thailand?
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  What could be causing our Ford Galaxy to cut out? 22 Jul 2013 (Ask HJ)
  Our 1999 2.3-litre petrol Ford Galaxy is suffering from an intermittent lean fuel mixture and cuts out on a fairly regular basis. The dealer wants us to...
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  Why does Ford publish misleading MPG figures for its Focus? 13 Jul 2013 (Ask HJ)
  I am in the process of selling my Focus, as my Mercedes-Benz does as many MPG as it and is a much better car. Ford should hang Its head in shame advertising...
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  Poor fuel consumption 23 Jun 2013 (Ask HJ)
  I owned a Lexus RX400h, which gave consistent results of 34mpg summer and 33mpg winter. My current Lexus Rx450h (2009 with 70,000 miles) doesn't get...
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  Will the larger 3.0-litre BMW X3 be more thirsty than the 2.0-litre? 5 Jan 2013 (Ask HJ)
  I watched your video on the BMW F25 X3. At the time of making the video the more powerful 3.0-litre engine was not available. Do you have any comments...
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  Do the car manufacturer's have their misfuelling prevention devices backwards? 15 Dec 2012 (Ask HJ)
  I think the motor industry has got it the wrong way round in its effort to prevent misfuelling. It is impossible to put diesel into a petrol tank but this...
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  Air in my diesel fuel system 14 Nov 2012 (Ask HJ)
  I have the a Citroen Berlingo with the 1998cc HDI engine. It has nearly 160,000 miles on the clock, and has been fully serviced. Runs brilliantly, except...