What's your question? Search here
Further to the information that you gave to the Mazda owner last week, I would like to add the following in your defence. The owner did not state what mileage he had covered. Generally, engines tend to "loosen up" after about 6,000 miles or so thus improving mpg attained. Motor manufacturers are governed by very strict guidelines as to how they obtain their mpg figures and for this reason, all tests are (or at least used to be) carried out on a rolling road. This, as we all know, bears no real resemblance to day to day motoring. Driving style, road conditions play a major role in this aspect, never mind the state of the vehicle itself, tyre pressures etc. Your reader would be best to ask the dealer to carry out a controlled mpg test. This involves the dealer witnessing you brimming the tank, you doing an agreed mileage and then bringing the car back with the dealer again, witnessing the car being filled back up. It is then down to simple mathematics.
Asked on 20 March 2010 by G.S., Kirkcudbright
Unfortunately, manufacturers now flock to a certain very low resistance chassis dynamometer in Spain in perfect ambient temperatures to get their cars certificated at unrealistically low CO2 levels for tax and sales reasons. But the EC is now instituting 'in service' CO2 and fuel economy tests by which a car cannot vary by more than a few percent from its certificated figure after 100,000kms. I surmise that unless manufacturers can find another way round this, it might catch a few of them out and lead to cars being re-certificated in a different tax band with all the repercussions that will bring.
Dear Honest John,
Please help me choose my next car. I would like it to have:
I own a two-year-old BMW X3 3.0 Diesel Automatic. The 'birth certificate' for this car states it has CO2 emissions of 226g/km, which just puts it into...
I am writing on behalf of my 86-year-old father. He has a 2004, 1.6 automatic, 5-door Ford Focus. He pays £210 per year for road tax, but has noticed on...
I bought a Vauxhall Corsa 1.2 Comfort with Air Con, reg VX02 CUC at auction. Could you please tell me why the road tax is £145? I have looked at about...
Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.
Real MPG enables you to register the fuel economy you are actually getting against your make and model of car, its engine and type of transmission.
Every time you enter an average consumption figure against your car, the overall average automatically adjusts to reflect it.
A guide to how much VED you will need to pay on your car.