Interesting. Our old Terrano 2.7 diesel was lucky to return 27 mpg in selected 2wd, never did a full tank in 4wd. I preferred being able to stick it in 4wd when you wanted, never trust the Honda CR-V back wheels will kick in till after its too late! However, we have averaged 43 mpg in it over the last 4,000 miles. Not bad for a sort of four wheel drive big thing!