I currently have a Chausson Flash 11 and if I drive carefully I can get it above 20mpg. It's a great van with loads of space, but my problem is this: I typically do about 1000 miles on a trip and will do well into double fugures trips in a year, Glasgow to the south coast. What I really need is a van that will do 30+mpg but still sleep 4. Anyone know which van I should choose?