You can look at my milage data on the "COMPARE" tab (WVGasGuy). Hold your cursor over the more link and it will show you my tanks that were trip vrs local driving. My trips were usually 125 miles although the entries with the larger tanks were a 500 mile trip to Nags Head.
It's difficult to compare trip milages. My best milages in my opinion were the 36+ mpg tanks as they were in the mountains and that's impressive. Going from Central WV to Charleston I recently got 43 mpg. Coming back I got 40 mpg. Obviously more downhill difference in going to than from.
If your trip is going to be reasonably flat (and I see you have a 2wd HH, so you are at least in non-snow country, probably flat) you should with good hybrid driving techniques be able to get 40 mpg (in a TCH, not a Highlander). If you're heading to the mountains you may have to work to get 36. I do drive at or under the speed limit, although I have not seen a serious degradation of FE as I increase speed as long as I continue to glide when possible, even at 75
mph.
You do realize that on that 1600 mile trip the difference in 40 mpg average vrs 36 mpg average is less than 4.5 gallons? Either way not bad.