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  Car losing power and revs 23 Dec 2011 (Ask HJ)
  My Clio is playing up when idle - it will drop revs, nearly cutting out but then it revs back up and just keeps doing this until I turn the engine off....
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  X-Trail error code 26 Apr 2011 (Ask HJ)
  I own a 2004 Nissan X-trail 2.2 diesel. Whilst I was driving the car suffered loss of power (limp mode). Diagnosis was done by a trustworthy local...
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  Why are your correspondents surprised that they can't match their car's official mpg figures? 3 Apr 2011 (Ask HJ)
  Your letter-writers often complain that they can't match their car's official EC mpg figures. Surely it's common knowledge (or ought to be?) that these...
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  Should I have the oil changed in my Volvo V70 following the DPF recall related to oil contamination by fuel? 3 Jun 2010 (Ask HJ)
  You probably know that Volvo have issued a safety recall related to rising sump oil levels in their D5 Diesel engines with a DPF, which is caused by excess...
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  Company car replacement advice. 14 Mar 2010 (Ask HJ)
  My company car is due for replacement later this year and with fuel price increases due to continue I need a vehicle that is frugal. My annual mileage...
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  Smart fuel consumption 15 Jan 2010 (Ask HJ)
  I wonder if you can give me some advice, last April I purchased a new Smart ForTwo CDi, primarily based on its published fuel economy of 85.6mpg, or 621...
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  Stop start economy 11 Jul 2009 (Ask HJ)
  I have an excellent Volvo 480 but it is 15 years old, and I am thinking of buying under the "scrappage" scheme a new "Volvo C30 DRIVe". However, advertising...
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  Is it cheaper to charge a PHEV at a commercial charge point or using the petrol engine? 12 Mar 2024 (Ask HJ)
  I own a Ford Kuga Titanium PHEV. Is it cheaper to charge the battery at a commercial charge point or by charging it using the petrol engine?
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  Should I use premium fuel in my Honda Jazz Hybrid? 15 Aug 2022 (Ask HJ)
  After many Honda Civics that never went wrong, the new one is too big now so I am getting a Honda Jazz EX to mimic the "glide silence" of my Honda E for...
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  Why do you advise keeping a car's air con switched on? 21 Feb 2022 (Ask HJ)
  You recently advised that the best way to keep your car's air con healthy is to keep it switched on. I think that's bad advice as it uses up to 10 per...
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  Will a diesel Volkswagen Golf be more economical than the petrol version? 16 Mar 2013 (Ask HJ)
  New Golf 1.4TSI petrol or new 1.6TDI diesel? I’ve done the maths. For both cars after three years at 8000 miles per year at urban mpg (43 petrol and 62...
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  Vauxhall contribution to fuel pump repair 10 Jan 2013 (Ask HJ)
  I have a 56 plate Vauxhall Zafira 2.2 Direct. Engine warning light came on and the car just stopped and would only do 5mph. Scary as I had just left dual...
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  Should I switch to diesel, now my annual mileage has doubled? 5 Nov 2012 (Ask HJ)
  My commute has recently become longer, and as a result my annual mileage has changed from 10,000 to 20,000 miles. I currently have a 06-plate Volkswagen...
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  Is it credible that the new Mercedes-Benz CKS 350 petrol returns 40mpg? 5 Mar 2011 (Ask HJ)
  I was surprised by the fuel consumption claim of 40mpg combined for the new Mercedes-Benz CLS 350 petrol model. I think the old model 320CDI was 36mpg...
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  Should I used a diesel additive? 15 Jul 2024 (Ask HJ)
  Should I use additives in a 3.0 Jaguar F-Pace diesel, other than AdBlue?
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  Should I used premium petrol in my BMW Z4? 8 Aug 2022 (Ask HJ)
  I drive a BMW Z4 M40i, will I benefit from using premium grade petrol such as Shell V Power?
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  Is there a drag coefficient directory? 29 Jun 2022 (Ask HJ)
  I do a lot of motorway miles and am keen to find an aerodynamic car - most makers publish drag coefficients (Cd) but I'm struggling to find CdAs Cd x frontal...
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  Can you recommend an efficient seven seater? 24 Jul 2020 (Ask HJ)
  Can you recommend a reasonably efficient, petrol, seven seater? I have about £12,000 - £13,000 to spend. Thanks.
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  Is there any way to improve fuel economy? 13 May 2020 (Ask HJ)
  My Kia Venga petrol auto 1.6 drinks petrol. Is there anything I can do to get better MPG. It's a 2016 model with only 30,000 miles on it.
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  Why won't my Transit rev above 3000rpm? 10 Mar 2020 (Ask HJ)
  I have a 2016 Ford Transit. The fuel filter light came on and a message said it’s blocked. It won't rev above 3000rpm. I changed the fuel filter this morning...