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  Auto 'box 'HOLD' switch - does it save fuel? 6 Jan 2014 (Ask HJ)
  Does using the 'HOLD' switch on the Subaru Forester's auto gearbox reduce fuel consumption? And is there any downside to using it other than reduced acceleration?
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  Which fuel should I use in my Audi S5? 5 Oct 2013 (Ask HJ)
  I've just bought an Audi S5 Sportback; the preferred petrol is 95 RON as marked on the filler cover. Can I use Shell Vpower or is this too rich?
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  Fuel injector change - easy? 9 Jan 2013 (Ask HJ)
  I am just inquiring whether changing the fuel injectors on the scenic is a straight forward job, i ave changed the plugs and coils at present but need...
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  Do diesel engines use more fuel in Winter? 24 Feb 2012 (Ask HJ)
  Can you tell me if diesel engines use more fuel in winter?
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  Missing additive tank 24 Apr 2011 (Ask HJ)
  My Peugeot 406 coupe is missing its fuel additive tank. What will it do to the car and its performance?
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  Fuel additives 18 Apr 2011 (Ask HJ)
  My daughter has used Lucas upper cylinder lubricant as a fuel additive with her Honda Civic 2.2 cdi and experienced much better mpg figures. Would this...
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  How reliable is the Lexus GS300 and what's fuel consumption like? 26 Aug 2010 (Ask HJ)
  I would like to enquire about the reliability of the Lexus GS300 2001 model. What is the average fuel consumption? Is there anything in particular I should...
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  My Ford Mondeo won't start - where's the fuel pump? 7 Sep 2010 (Ask HJ)
  My Ford Mondeo has been laid up for six years but has regularly been started. Today I am trying to start it and there is a spark at the plugs but they...
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  Why aren't fuel pumps designed so that nozzles can't be replaced wrongly? 22 Aug 2010 (Ask HJ)
  Can anyone confirm that all petrol nozzles at a fuel station will also fit in the diesel holder of the pump? Around eight months ago I filled up at...
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  What's the fuel economy of a diesel Hyundai iLoad with a light load? 9 Mar 2017 (Ask HJ)
  What's the fuel economy of a diesel Hyundai iLoad with a light load?
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  Rattling fuel tank baffles 24 Dec 2012 (Ask HJ)
  My 2003 SL350 has rattling baffles in the fuel tank. Mercedes will not repair FOC even though they lost a court case on this elsewhere in 2012. Can you...
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  Can I run my classic Mercedes-Benz W123 E-Class on unleaded fuel with an additive? 11 Jun 2010 (Ask HJ)
  I am buying a 1982 Mercedes-Benz W123 200E. It is in superb condition, having only covered 99,000 miles. Would it be better to run it with unleaded fuel...
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  Peugeot 406 showing faults P1138, P0101 and P0191. 29 Sep 2012 (Ask HJ)
  I own a Peugeot 406. The engine cut out whilst driving; fault was diesel pressure sensor. Replaced sensor. Engine diagnostic light on again and the car...
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  Is coasting downhill better than descending a hill in gear? 30 Jun 2012 (Ask HJ)
  With my DVLA road tax reminder I received a leaflet exhorting me to save money (and petrol) by adopting a “smarter driving style”. Included was the advice...
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  This Italian car website shows the fuel consumption of various cars at top speed. 8 Apr 2012 (Ask HJ)
  I thought you might find this interesting from an Italian car magazine - fuel consumption at top speed. If you wish to look at other models, go to www.alvolante.it,...
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  Engine problem with my BMW 5 Series 2 Apr 2012 (Ask HJ)
  My BMW has a problem. When accelerating it immediately starts to shudder. I stop and the engine is very rough as if it is misfiring.
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  Why aren't modern cars fitted with freewheeling devices like that found on the Rover P4? 27 Aug 2011 (Ask HJ)
  Rover fitted a selectable free wheel device to its ‘Aunty’ models in the 1960s. I recollect my father using it for most of his driving. Why has something...
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  Diesel additives 6 May 2011 (Ask HJ)
  Today's diesel fuel is low sulphur - an EU requirement for polution control - but sulphur helps lubricate the fuel system. I have been told that by adding...
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  Why is my fuel economy 7mpg less in winter? 25 Jan 2018 (Ask HJ)
  Why is my fuel economy 7mpg less in winter? Since the weather has got colder, my fuel economy has got a lot worse. From an average of 43mpg in summer,...
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  Technical problem need advice 17 Feb 2013 (Ask HJ)
  Our car, a Golf TD is having problems starting. It has an intermittent problem when some days it takes a few seconds to fire. On one occasion it wouldn't...