Ask Honest John

Most recently answered premium fuels questions
What evidence enables you to recommend certain fuels to your readers who are worried about supermarket fuels?
Is there an ESSO product that is equivalent for Shell V-Power for both petrol and diesel?
I'll shortly be taking delivery of a new Porsche Boxster, just as it's time to start thinking about winter tyres (which I've never had before). I can buy a set of Michelin Pilot Alpin for the existing...
I wrote recently, and thank you for the reply, about my 2011 X-trail and the "flatness" around 2000rpm. My dealer says they all do it, something which I cannot believe and after much effort have now got...
I usually put manufacturers' advertising claims down to empty rhetoric designed to do little other than shift a possibly indifferent product. As a user of Shell V-Power petrol, I am aware of their heavily...
Am I wasting money by occasionally purchasing Esso Supreme? I do this with the idea of it perhaps cleaning the engine and parts of my Mazda 5 Sport. I do only 2000 miles a year.
My six year old Ford Focus only just passed the MOT emissions test, and I have been advised to use super unleaded petrol to keep the engine clean, is this a wise move?
Is there any benefit in using Shell V-Power diesel in my new Octavia 1.6 DSG or is it intended more for high performance cars? I only do about 6000 miles a year.
I drive a 2007 Volkswagen Passat 2.0TDi 140 SE saloon. Could you please advise me if using Millers Diesel Power ECO MAX fuel additive is worth the expense? I normally fill up with Shell diesel but I do...
Following your advice in the Telegraph to use Shell V Power or BP Ultimate Diesel I can, with certainty and experience, say it is the best thing I have ever done since taking ownership of an imported 2.5...