Now there are some who may argue if you own a Ferrari mpg is somewhat irrelevant and to an extent I'd agree but I decided to measure mpg over the weekend The scenario is, well, balls out to be honest and over the weekend I appear to have averaged less than 15mpg, perhaps around 12 mpg I leathered the car off this afternoon and the area at the rear of the car especially the slats that run across the rear of the car were pretty well covered with soot. I am wondering if the car is running rich? Like I say it has been a spirited weekend and I am not afraid to drive the car to the maximum 'where road conditions allow' Is 12mpg pessimistic? I am not bothered one way or the other but if it's running rich then it might as well be leaned out. With a '91 there is obviously no cat so rich running is not an issue and may explain the heavy sooting on the rear bodywork Is the Testarossa that 'dirty' in environmental terms?