Maybe...
I did not notice any difference in fuel consumption.
You should first check directly with any of the propeller manufacturers before ordering since the hub may make a difference. Just give them the stock two blade spec's and they can figure it out from there.Did you notice better fuel economy and higher speed VS rpm at cruising speeds 5-6k?
Gori offers a 18x13 I think that should be good eh?
http://www.defender.com/product.jsp?path=-1|311|53222|297678&id=146208
I did not notice any difference in fuel consumption.