i have recently bought a V reg v6 cougar to raplace my v6 probe and the cougar is only giving me around 20 mpg is this normal ? as the probe and the mondeo v6 i had before that both returned around 25 mpg i have many spare parts as i ended up breaking the mondeo for parts and most of it is laying around the place i just need an idea of what is most likely to be the culprit ,the cougar doesn't seem to be as quick as my previous v6's maybe it is connected to the fuel problem .