I managed a best of 52mpg in my Type R over 30 + miles. It did involve some special economy driving techniques but start and finish points were roughly the same elevation and I was traveling as fast as the rest of the traffic. Useful to know what it can do if you get caught short of fuel. There is photo evidence on the type R fuel economy thread:
Type R fuel economy
However, if you use the performance it can drop into the low 20s or even teens!