I do a LOT of motorway miles, and - although this is probably the best type of journey for MPG in the Lex, I get through a full tank every 4 days (64 quid!), totalling nearly 250 per month. This, with a new house and more bills, has meant that my only other option would be a ...... diesel.
..the is220 is a bit outta my price-range right now (although there are good models to be had), so I've stuck the snow button on for about a week now - I filled up on Thursday morning last week and I've still got enough to get me to work and back tomorrow - I reckon it's given me an extra days worth of journey, which is about the same as the Diesel Focus I had during a recent bit of insurance repair (although I was driving that pretty badly because it was a bit crap)