Ask Honest John

Most recently answered fuel economy questions
Some friends are looking to change car soon. They are obsessed with emissions issues and look for low MPG cars with low carbon. Their current car (Smart) does not come remotely close to its real MPG....
Due to becoming a father, I am looking to upgrade my partner's 2006 Vauxhall Corsa to a family hatchback/SUV. Main points are: bootspace, economy (min 40mpg mix then petrol, if not diesel), reliability,...
My Toyota RAV4 2.2 diesel is disappointing in its fuel economy and only averages at 27mpg. I would like to have something with similar versatility, comfort and quality, but better MPG. Can you help with...
I am planning to buy nearly new, small car. I drive around 15,000 miles annually and want something that is economical. I am wondering between Ford Fiesta, Toyota Yaris or the Honda Jazz. My budget is...
Your Real MPG figure seems about right for my car, but do you take account of the fact that there seems to be about an 8MPG difference between summer and winter? My Prius will do 59MPG in the summer and...
I recently purchased a 2009 Vauxhall Insignia 2.0 diesel with 140.000 miles on the clock. It has a full service history and drives well. However, the fuel economy isn't very good. I average 36mpg, yet...
I was reading the engine specification for the new Audi A4 2.0 petrol auto. It just seems incredible. 53mpg. 0-62 in 7.3 secs. 190ps and yet only £30 per year in VED. What engineering wizardry have they...
Today I was returning home on the M42, I knew I was low on fuel but the trip computer said I had a range of 26 miles left. However, as I was approaching the exit slip to the service station the engine...
I have very recently passed my test and am due to start new job in two weeks time. I will be commuting 500 miles a week, so need something with great MPG which can handle motorways. It will also need to...
My Mazda 3 1.6CD DPF avreages only 30mpg in the city,and around 40-50mpg combined, what would be cause of this?