I experimented last week by driving like I have a 75 and not a ZT................. OK, only kidding guys. But I did adjust my driving style to a more relaxed form, using gentler acceleration and less full throttle - quite a bit less actually . The result - I leapt from 34/35mpg to 37.5mpg and that was exactly the same journeys as I take every week. It was also in conjunction with turning my Synergy2 up to setting 9 from the previous 6. So I'm fairly certain that this is something I will be doing in future more often .