What kind of chemistry do you have with your car? Love it? Loathe it? Let us know and you could win a £300 John Lewis voucher | No thanks
Ask a Question

Ask Honest John

Most recently answered supermarket petrol questions
Whilst driving along, my 2012 Mazda 3 1.6d (39,000 miles) suddenly juddered and went into limp mode. I cautiously negotiated to the hard shoulder with the dashboard lit up with maintenance, ABS, and warning...
You mention that supermarket petrol can clog up engines and reduce MPG from the deposits in their additives. I understand that it's best to use branded super unleaded. Is it the case that branded normal...
I have a new Toyota C-HR Hybrid in which I'll do about 8000 miles per year, mixed driving. I also have a 2016 Toyota Aygo semi auto in which I do about 4000 miles per year, mostly short journeys. Would...
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 been told that Sainsbury's fuel is supplied by BP...
I have followed your site for some time and have many a time heard the advantages of Premium diesel (or even branded diesel) over supermarket diesel. I myself have experienced the improvements. My question...
It was recently suggested to me that fuel obtained from supermarkets is inferior to that obtained from filling stations and service areas and is “diluted” in some way, resulting in lower performance and...
Our 2002 Renault Scenic 1.6 automatic has clocked exactly 45,000 miles. On a recent motorway journey of 150 miles I decided to check the economy and was horrified to find it was only 26mpg. We only use...
I always find V-Power fuel to be really good on engine of all the fuels that I have used over the years. Does this mean using supermarket fuels result in less mpg due to higher RPM, more carbon deposits,...
I wonder if it's been noticed that Shell has recently bought virtually all the other petrol stations in the Camberley area. We had an Esso, a Texaco and I think two other brands. They are now all Shell....
I know you are not in favour of supermarket fuel, so I decided to check it out against my normal fuel which is Shell regular diesel. I drive a Nissan Pathfinder and for my test I drove from Cheshire...
 

Value my car