I have recently purchased a 03 (UK car) SC430. The previous owner added a set of custom exhausts, and although they look really good and sound excellent my fuel consumption is down to 15-16mpg max. It seems I am putting £70-£80 a week in petrol in the car. I am tempted to go back to the Lexus exhaust but dont want to rely on brochure figures of fuel economy. I would be very pleased to here what the fuel consumption is like for SC430 owner with the standard exhausts. So please dont hesitate to add your comment