Just fueled up both tanks. Got 14.7 mpg on the tank that was used to go to Denver and back. Not bad considering about 140 of the 177 miles on that tank were above 75 mph.
The other tank is just back and forth to work (almost 40 miles round trip) and running around town. That tank yielded 15.65 mpg!!
I plan on taking the top of the fuel pressure regulator off soon and do the quarter trick; that is, putting a quarter or similar sized washer under the FPR spring. That is usually good for a .5 to 1.0 psi increase.