My V8 gets about 20-21mpg and that gives me around 400klm range if I am careful...but last fill was from close to empty and cost $130 (80 l @$1.62/l)
Having just fitted a snorkel, I will have to do another fuel run and see if the economy has improved with the better breathing. I have a sports exhaust on it that made almost no difference, but Wolfy from Canada said his improved after the snorkel, so I am keen to see if and when I will eventually get the $700 smackeroos back.