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Regor,
I noticed something similar to you this tank as well. Maybe the air temp.
I had "gratuitous" use of the AC on my return trips on my commute this tank because of the heat here in central california. I was able to break the 50MPG ceiling, I believe, because I was stuck behind a big rig for 30+ miles and was able to get a crazy increase in mpg on my ScanGauge2- somewhere in the mid 80's mpg range! I shot up my overall economy without even trying. Maybe you had a similar situation (of drafting).
The experience really does illustrate how much air resistance robs us of MPG. I never would've believed drafting would yield such an increase in mpg, if I hadn't seen it myself. It's almost like driving downhill! All the while the AC was on- so you can bet I'll be looking for more trucks on my commute.
I have also noticed a bit better MPG driving home in the hotter afternoon, than in the mornings, which lends to the warm air increase hypothesis.
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