ok, so with all this travelling about and jetting back and forth over the pond the last 1.5 years, i've had to sell 3 cars and buy another 3.
The whole mileage thing is weird. I'm a nerd so I calculate my mileage when I get another car. Here's the results:
1.8 ltr Renault Scenic - 30 mpg
1.6 ltr Hyundai Lantra Estate - 32 mpg
3.4 ltr Pontiac Montana - 28 mpg!
It seems that it just doesn't matter what you buy, unless you've got a tiny bubble car or a huge pick up truck, it just doesn't matter what you buy in engine size for anything in between.
These are all tip top cars btw. I'm very picky and calculating when I buy a car and make sure I'll get a good price on re-sale.
Screw it. When I get back to the UK I'll just buy something that suits the family and worry about stupid engine size.