New 2012 M35h owner checking in. I purchased mine about 2 weeks ago. Put ~500mi on it so far, averaging 27.5mpg with about a 50/50 mix of 70+ MPH freeways and ~30mph stop-and-go backroads (I have a 37mi each way commute).

I did have an issue with the heater not working on the driver's side that Sewell Infiniti determined was caused by a clogged transmission cooler. It was fixed in a day and all is well so far. Now I'm considering the extended warranty. LOL!

I've had my m35H since july 2016. I've been using Fuelly at EVERY fill up since. Just checked my account, i average 24.8 over 129 fill ups.

now... if you look at the onboard computer... it shows 26.5. I've noticed that the onboard computer is off by about 2MPGs at every fill up.

My type of driving is about 50/50 (city/highway), I do have a bit of a lead foot, so it would be better if I was gentle. The best I've ever gotten was 29MPG on a full tank. Now, I can see if someone is on a long hwy trip in a speed limit range can get over 30, but it's not happening here.