Ok i have the good old rattly plenum on my newly aquired zs, its not done many miles but im in the process of getting the belts done so im spending a fair amount on this one
the question i ask is that the mpg on this one is not as good as my other 3 previous zs 180's, is this because i have a rattly plenum, the car runs sweet apart from the plenum issue, also i notice i havnt the 3k vis kick (but that does'nt bother me as im going to replace plenum and vis motors at the same time) So why is it drinking fuel quicker than phil mitchell on vodka????