mpg doesnt have to be the be all and end all, i suppose its a shock if youve been driving a diesel and getting 50ish and then getting 30ish or worse in a petrol. if your happy with whatever car you drive and can afford its thirst then whats the problem.
i appreciate that for some times are hard and fuel economy is a higher priority and it has to be horses for courses. its like choosing any car you need to prioritise the different capabilities of the car to your needs.
if your a high miler and fuel cost is an issue something that does 30 mpg or less isnt going to be high on your list.