My 2013 FFH was built in September 2013 I believe. I didn't take delivery until Jan. For four months of driving 6000+ miles I'm averaging lifetime of 38.1mpg. Awfully disappointing, so I began to search for answers, after taking my car in for a check engine light on, a sillenoid seal was replaced and the mechanic told me "you should see a significant improvement in MPG". False. Still same. However, I tried an experiment with the AC completely off since I read that in hybrids the AC can really really affect the MPG... for two days of driving I'm averaging about 49-51 mpg all of a sudden. Voila! It's the damn AC causing such horrible MPG (for me at least). (Which is still pretty messed up that they advertise 47mpg knowing that people use the AC). Anyway try no climate control for a tank of gas and post what your mpg is after that!!! 20% better in my case so far but I need to do a whole tank of gas!!