Ask Honest John

Most recently answered fuel economy questions
Last year my Jaguar X-Type diesel's fuel consumption suddenly dropped from 52 to 44mpg. I have put two lots of injector cleaner in the tank; changed the fuel & air filters; checked the MAF and DPF operations...
I am in the market for a convertible and know you extol the virtues of the FIAT 500. Would it be silly to pay the extra for an Abarth pokier version, or just go for a top engine ordinary FIAT 500C? My...
We are focusing on news regarding fuel additives for use in diesel engines. With diesel cars now over 50 per cent market share in the UK, and very significant numbers in use, there's a valid story concerning...
I do 33,000 miles pa mainly on my 110 mile per day commute along fast A roads and dual carriageway. I have a poorly left knee and am six foot tall with long legs so need a comfortable automatic. I am...
More and more people are looking at tuning their diesels for more economy and or power. In this day and age of ridiculous fuel prices isn't it time we had a decent investigation into the pros and cons...
I drive 8000 to 9000 miles per year, mostly shortish distances. I have to replace my Honda Accord diesel. I would like a 4-door saloon or hatchback, petrol at about £10,000 without trade-in, not more than...
Within certain limitations, and if I put my mind to it [with current diesel prices, I try very hard so to do], I drive very carefully. With a full load, my Suzuki manages 36 mpg, but with just the driver,...
What are your choices for a true 60mpg car ? I'm looking to change my current car, 2008 Peugeot 207 SW 1.4VVTi for something more economical as I now have to drive to work two days per week 100 miles...
New Golf 1.4TSI petrol or new 1.6TDI diesel? I’ve done the maths. For both cars after three years at 8000 miles per year at urban mpg (43 petrol and 62 diesel) and local fuel prices I’ve calculated petrol...
The accuracy, or otherwise, of manufacturers' fuel consumption figures attracts regular correspondence but my question is slightly different. We have just taken delivery of a new Vauxhall that boasts start/stop...