i know this topic may have been covered many times before and i have done a search, but the majority is talking about FRs. I had a fault with the coolant sensor on the leon before and had it replaced since i thought it might have been the cause of my bad mpg. At a 16 mile run without giving it the heavy foot i'm only averaging 42mpg, is that correct? What is everyone else returning? In the past i would be able to average 48 to 52mpg no bother. What can cause this? thanks