Is supermarket fuel inferior to petrol station fuel?

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...

What do you think of the Fiat 500 and should I go for a petrol or diesel model?

I am looking to change my car from a Citroen C2 to a Fiat 500. I'm interested in economy and will probably keep this car for at least 10 years. I have always liked diesels but am worried about the problems...

BP or Shell premium diesel?

Within easy reach of my house consistently BP premium diesel cost 4p less than the Shell equivalent. Which would you buy, please?

Would you recommend Terraclean performance tuning for my BMW 118d?

I am considering trying Terraclean performance tuning on my BMW 118d, in the hope of improving emissions and improving performance by removing engine carbon deposits. Do you know if such a treatment is...

Thanks for recommending Shell V Power fuel.

This is a letter of genuine thanks for continuing to push Shell V Power. I had ignored your advice for what seems like years, but finally gave in on the mention of Nitro (I just loved the film ‘Ronin’)....

What's causing my Mondeo diesel to hesitate momentarily?

I have noticed while travelling between 50-70 mph that the engine of my Mondeo 1.6 TDCI seems to hesitate or cut-out momentarily, and then cut back in immediately without any dashboard indication. What...

Has anyone tested the mpg figures across different fuel brands?

Assuming identical driving conditions, should similar miles-per-gallon be achieved no matter which fuel company's products are used? Have results been published of such tests being carried out, comparing...

Why is my Nissan Primera automatic only returning 18-20 mpg?

I bought a 1999 Nissan Primera 2.0i automatic two years ago. It had 9000 genuine miles on the clock. The previous owner had ongoing health issues and the car was mostly off the road and stored in a garage....

Can I run 87 or 89 octane fuel in my Mazda CX-7?

We recently purchased a low mileage Mazda CX-7 as a second car. The 244HP 2.3-litre turbo engine is very thirsty and the manual calls for 91 octane fuel. Can 87 or 89 octane be used without harm, other...

Is there a difference between French and UK pump fuels which can affect fuel economy?

I was interested to read your comments about the KIA Sorento. Two years ago I took delivery of a new KX3 2.2D and the following day started a journey to the south of France. While it was running on UK...