MPG question

[Longshot270]

I promised earlier that next time I took the route that gives me the best mileage I would keep an eye on the AVG MPG. Here is a basic description of the trip. The total mileage is 40, first 10 are a rough windy road, then it is about 15 miles of strait worn roads.(55 mph average) The last parts are 10 miles of highway followed by 5 miles of city. (75-85 mph and then 0 with some 45) The route also has a total change of 80 or so feet in altitude but it is mostly going up and down hills. I also had to push through a good breeze that hit the front passenger corner most of the time.
Well now you have a general idea of the route so here are the results.

On the first half I got up to 22 but mostly it stayed around 21.7
Then on the highway going 85 it still didn't drop below 21. Hit the city and it fell to 19.9/20.

I will admit that I did have to drive smart with the pedal to get those numbers though. I didn't have to drive like there was an egg between me and the pedal but I did let my momentum bring me up hills and around corners when I could. I also reprogrammed the truck to shift lower in the upper gears (but only 3&4) and lowered 4th gear TC -10. I used my custom 87 as my baseline. (That tune is still full of suprises.)

I believe that the gotts mod, lowered shifting/locking and cold weather played a part because those numbers were pretty much a record. In the picture you can see my truck isn't the most aerodynamic vehicle in the world with a grill guard, level kit and that cb antenna that causes a suprising amount of drag. I also had 2 mountain bikes, an ice chest and a potted plant.
...the plant and frozen steaks must have been pedaling when I wasn't looking.