fuel | Ask Honest John

Ask Honest John

Most recently answered fuel questions

My local BP garage is still charging £1.55 per litre for their cheapest diesel, much more than any prices mentioned in the article (although in November 2023 it was 10p more at £1.65). Why would BP be...

Can I modify my car to save fuel?

A local company says it can adjust the fuel use of my Citroen C5 6 spd, 2.0 HDi, upping it 10% without risking any parts. I'm a slowish driver, mostly 2,000 rpm and have the car in eco, whatever that does....

Is it better to top up fuel at half a tank or to refuel when almost on reserve?

Is it better in the long run to top up fuel at half tank on a regular basis or to refuel when almost on reserve?

Is Xenum petrol additive any good?

A friend has suggested that I use the above but would welcome your comments. I drive a BMW 420i cabriolet auto and a Toyota Aygo X auto. I rarely use supermarket petrol and mostly use BP or Jet.

Can I use E10 petrol in my Skoda Fabia?

I drive a Skoda Fabia 2021, what type of petrol is best to use?

Should I fit a fuel saving device?

I have read about a device that plugs into the car under the steering column and claims to reduce fuel consumption by about 35 per cent. Is the claim valid? Is it safe to use? Seems strange that the technology...

Do you have any feedback on fuel-saving devices?

Do you have any feedback on fuel savers that plug into a car's tuning system that are being marketed at the moment?

Which cars can use super ethanol (E85) fuel?

There is an increase at the pumps in France of super ethanol. Which UK purchased cars can use it?

Which fuel should we use in our petrol Fabia Estate?

We run a 2012 Fabia TSI Estate with a 103bhp petrol engine and we hang on to our cars until they give up the ghost. Could you please tell men what grade of fuel would be best suited to it in the long term?...