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  Is supermarket diesel as good as BP? 3 Sep 2016 (Ask HJ)
  I run my Toyota Auris 1.6D on Sainsbury's diesel for two tanks and then two tanks of BP Ultimate. The car runs very well on both brands of fuel. I have...
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  I like the new Mondeo - what's the best engine choice for a 60-mile each way motorway commute? 9 Aug 2016 (Ask HJ)
  I like the new Mondeo and want the best engine choice for a 60-mile each way motorway commute. The 1.5 TDCi ECONETEC offers best fuel economy, but Ford...
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  fuel grades 15 Jul 2015 (Ask HJ)
  I use Shell Nitro unleaded in my M4, what is the equivalent grade for Esso, BP and Texaco please (on the assumption that I cannot find a Shell station)?
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  Why won't my car achieve its official fuel economy? 16 Feb 2015 (Ask HJ)
  I recently bought a Mercedes-Benz E-Class Estate (220CDI Blue Efficiency) and done 3000 miles. However, I cannot get much above 46mpg, which is a long...
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  Running-in a new car - what fuel should I use? 28 Feb 2014 (Ask HJ)
  Assuming that BP Ultimate or Shell V-Power diesel is not readily available (I am going abroad), do you recommend the use of Millers Diesel Power Plus during...
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  Why is my van running poorly? 6 Oct 2013 (Ask HJ)
  My 2007 Peugeot Expert van is running very sluggish. The problem is at its worse when running at a constant speed, with the van backing off then speeding...
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  Yaris fuel consumption 1.0 litre petrol - what should I get to the tank? 19 Oct 2012 (Ask HJ)
  I currently own a 1999 Toyota Yaris petrol 1.0 litre. I just wanted to know how much I should expect on a full tank.
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  Does using air conditioning affect fuel economy? 8 Apr 2012 (Ask HJ)
  The debate has started again as to whether using the air conditioning is more fuel-efficient than having the windows down. Which is correct?
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  Cruise control and fuel economy 9 Aug 2011 (Ask HJ)
  In the past few weeks you have said that a 'human' is likely to be more efficient than cruise control as a human wil allow overrun going down hills, which...
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  I changed my Ford Focus's fuel injector pump but does it need calibrating? 13 Sep 2010 (Ask HJ)
  The fuel injector pump went on my X-reg Ford Focus TDI 1.8-litre with the Endura engine. I've replaced it with a secondhand one but still no joy! Does...
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  Law and hoarder 15 Aug 2009 (Ask HJ)
  I have noticed recently, that the price of petrol has been creeping up faster than diesel. In fact I have seen it in some garages, higher than diesel....
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  Saving fuel downhill 19 Sep 2011 (Ask HJ)
  Is the petrol cut off to the engine when running downhill?
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  Tyre ratings are confusing, can you help? 10 Mar 2021 (Ask HJ)
  I'm currently looking at new tyres for my car and am so confused by the rating system. Can you explain how a £64 'budget' tyre and an £89 'mid-range' one...
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  Diesel freezing in the Alps - how can I avoid it 21 Nov 2012 (Ask HJ)
  My car, a Mazda 6 TS2 Diesel 2.2, is kept in the Alps during the winter at a height of 1300 meters. In February for two weeks, the temperatures ranged...
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  Am I wasting my money using super unleaded fuel? 4 Jul 2017 (Ask HJ)
  I have three cars - 2011 Mazda MX5 Roadster 2.0-litre, 2011 Mazda 2 TS2 1.35-litre and 2016 Skoda Yeti 1.2 TSI SEL. I am using Shell V-POWER U/L in all...
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  Is the stop start system in my Honda Jazz more trouble than it is worth? 4 Mar 2024 (Ask HJ)
  I have some doubts about the benefit of this facility. Every time I come to a stop with foot held on the brake the engine stops and release the brake and...
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  I'm unsure if my 1982 Ford Sierra was converted to unleaded - should I run it with lead additive or on unleaded petrol? 21 Aug 2018 (Ask HJ)
  I recently returned to the road my 1982 Ford Sierra 1.6 (petrol, pinto, manual) I believe it came off the road in 2002 or earlier, long before I purchased...
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  Please warn your readers about hire car companies in Spain overcharging for returning cars with no fuel. 23 Aug 2011 (Ask HJ)
  I booked a hire car in Majorca in June though a broker paying in full in advance. The terms and conditions on the voucher (there are also terms and conditions...
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  Should I expect better fuel economy from my Mercedes-Benz C200 CDi Estate? 12 May 2011 (Ask HJ)
  Last September I replaced my C220CDi Mercedes-Benz Estate (85,000 miles) with a Blue Efficiency C200 CDi Mercedes Estate – both diesel automatics. Over...
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  Why is my Mazda 6 returning just 40mpg when it is advertised as returning up to 52mpg? 10 Feb 2011 (Ask HJ)
  I bought a Mazda 6 estate 'Takuya' edition in September 2010. It’s a 2.2TDi (163ps) with an advertised mpg of 40.9 urban and 52.3 combined. Given the rising...