One thing I have noticed - especially after Mikes and Bec's wedding last weekend - I was stuck in heavy traffic and was going to be late so had to ahem... press on shall we say to get to Wrexham on time, but eased off rest of week and well I still got between 400 - 425 miles to a full tank? So bottom line is drive like Grandma or drive like Grandad (on speed) and it wont matter much
As we all say here if your worried about economy dont buy Zed's, diesels are only good for long trips not around town , fuel is dearer, servicing dearer and parts are too, so you need to keep a diesel for a long time to get that lot back? its about personal choices and what suits you and your family at that time?