I don't know any secrets but I have to ask: With your 32 mi commute, how much is not highway? That makes a huge difference. I'm about 8 miles from the highway, and the only way I can get a full tank anywhere near 42mpgs is to drive almost 100% highway. Like Ma to MD or to Lake placid and back.
You say you're speed is between 70 and 75, that's a big range. How many times do you throttle up and down from one speed to another? I would guess that if you're in traffic that results in a lot of speed changes over 30 miles, fuel economy will be effected significantly.
I also believe that warm up time to best economy is also a lot longer than you might realize. For instance, I drove 6 mi to the highway yesterday afternoon, got up to speed and immediately reset the trip computer. Fuel economy (per computer) indicated about 36 mpgs. Slowly, over the next 12 miles, the indicated fuel economy went up to over 40mpgs. Yes I know these numbers are not absolutely accurate but they are in a relative sense. What this tells me (I think) is that even after the 6 mi drive to the highway, the car was still not warmed up fully. Over the next 12 miles or so, if finally became fully warm and I saw the indicated mpgs increase. BTW, I'm in Ma and it was about 32-35 degrees yesterday, so not extremely cold.
I will periodically do a mpg check by filling up right before getting on the highway before a long trip 100+ miles each way. I'll drive with the cruise control set for 70 and check fuel economy when I return. I've never seen the fuel economy less than 41 doing this. On the other and my average fuel economy is only about 34 in the summer and 31 in the winter over the last year.
Finally, I do think I looked at my torsion value once, but I never set it and don't remember what is is.. I did not have Vagcom when I did my BSM. I am now coming up on another timing belt change and will check it before and afterwards.