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FE for that tank is in, and we scored 19.24mpg. This is a new full-tank record for the Dakota, and by about a full mpg. It's also about 1.5mpg over the record for a pure commuting tank.
Now, possible alternative explanations. The weather, as I was saying earlier, is getting really nice lately. In removing the tailgate, my ruined bumper and the sandbags went with it, shaving probably close to 200lbs. One of my tires is having issues with air, so it fluctuated between 45psi, and 8psi during the tank. Average was probably 30psi but the truck pulled noticeably to that side when it was on the lower end.
This tank did include a road trip into the desert (evening trip so it was cool). Without the pressure of having to get to work, I was able to hold more economical speeds (averaged 50 or so, commuting usually 55 or so). I burned a huge amount of gas going over Mt Hood, but coasted in Neutral coming back, so I don't know how that changes the average.
This was also a compound-tank (went to the gas station once to top off for the desert trip.). This shouldn't affect anything because I added both fills together to the third decimal before dividing by total miles.
My next tank will suck because I'm driving really inefficiently and that tire is getting worse. When I get me new tires on (same type and size as before) we'll get another tank. Oh, and I'm due for an oil change, if that matters.
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