Great post, thanks for sharing! I will be taking a 1,700-mi road trip soon (Nor-Cal to AZ) and this is very helpful, especially seeing your mpg and segment ranges at speed. Having only driven the PiP for a couple weeks with the max drive thus far of 30-mi, still curious about long distance driving. Guess I need to look more closely at the Nav settings, was not aware about changing the speed settings...better read the manual...
I recently finished a round trip to Denver from Los Angeles in the PiP. I spent most of the time going around 80 mph, even over the 10,662-foot Vail Pass. For the entire trip I averaged about 48 mpg.