I have enjoyed the driving experience with my 4 cyl. 2003 Outback. So much so that I am considering the '05 outback. I may get the LL Bean edition as it only offers the the 2 tone color combo. I love the olive/military green as seen on the subdriven site. However, it only comes in a 6 cyl. , and I worry about fuel inefficiency. My '03 4 cyl. only gets on average 17-18 mpg all year round, and I am hoping it increases to at least to 21. How fuel efficient is the 6 cyl., and how durable is it compared to the 4 cyl?