I think the key difference versus your car analogy above is that people bought the product on a price/GH basis... A more accurate analogy would therefore be if someone running a fleet of buses was sold a 80 seater bus with a promised fuel economy but the bus delivered in the end only seats 60 and is a lot less fuel efficient. So the changes in spec are clearly going to affect the bus operator's profitability and it isnt what he paid for.