Ask Honest John

Most recently answered mpg questions
Are the mpg figures for the Jaguar F-Pace petrol plug-in believable? How are they calculated?
What motorhomes see the best fuel economy?
I'm very undecided about which car I should go for. I'm looking for a big family car (estates or SUV) for regular short motorway trips. I initially wanted a diesel but concerned about the various issues...
I'm looking to buy a crew van with the best mpg. I do about 25,000 miles per year.
My Kia Venga petrol auto 1.6 drinks petrol. Is there anything I can do to get better MPG. It's a 2016 model with only 30,000 miles on it.
My 2016 Ford EcoSport 1.5 TDCi said I had 538 miles until the tank was empty when I first filled it. In the summer, it said 600 miles to empty. Tonight, I filled it to the brim and it said 508 miles to...
I have a Jaguar XE, nearly two years old, which averages around 39mpg on the computer set for long periods. 2000 miles ago I decided to check real mpg by checking fill-ups against mileage and was surprised...
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...
Would changing the tyre spec of a car change the mpg? If so, by how much? The Ines we are looking at come with an 18-inch alloy and we are looking at the 17-inch optional extra for comfort. Also would...
I just started a new job in which I'm doing 120 miles a day, mostly motorway, five times a week. What would be the most economical car to commute and what kind of mpg can I get? I can spend around £5000,...