Yes, I understand that. It's the best system, doesn't make it right though.Ayesha wrote:The mpg number on a new car's sticker is gained from a specific laboratory emissions test. The test is strictly controlled so every manufacturer performs the same test. Then mpgs can be directly compared.
Pick two cars with identical mpg figures. One could have a bigger engine or one could weigh more than the other but constant speed mpg lab tests are the same. In the real world with hills and traffic and loads of short distances could make the two cars very very different indeed. Overall economy can vary from car to car even though they may have the same publicly advertised figures.
I don't know how it could be done, but some figure for fuel consumption per mile per hour per load weight per acceleration per cold starting could be better. There are too many variables to make the publicised mpg figures any use at all.
There was something on the radio a few weeks ago about the way that the manufacturers test their cars, and one lady went into an argument with her car's manufacturer because she wasn't getting the mpg figure they specified. She lost the case because they said it was "her driving style". She disagreed, but the big boys won anyway.
It didn't make them right though.