Just got back from a run from central Texas to SW Oklahoma (the "Indian Territory" region until 1907. The 1905 proposed state of "Sequoyah" didn't fly with the US Congress, who didn't like the provisions in the drafted state constitution giving Indians citizenship, and both Indians and women the vote. Indian Territory got lumped in with the Oklahoma Territory to form Oklahoma in 1907. But I digress
1000 miles, combination of a bit of small town, a small amount of city (Lawton) but mostly 2 or 4 lane state highway at 60-65 mph.
Daytime highs were 100*-107*F. Gently rolling terrain. Overnight lows were... not. Sure wish I had a penthouse! My roof fan and Endless Breeze fans were very welcome.
16.2 mpg averaged over 4 tanks.
(Why 4? I drive on the "top half" of my tank, so refill about every 250-ish miles or so when possible. Makes for a good driver safety break on the longer days.)
This is about the same as I got in April over 3,000 miles in a loop out to the Navajo Reservation, Bryce, Capital Reef, Moab, Santa Fe, and back to Texas. Lots of 75 mph on the Texas highways; going into/with headwind probably balanced out).
Now that I'm thinking about letting Derek put a new top on my van, I wonder how it will impact the mpgs. And I'm also thinking about putting on a front hitch for my MTB.
2006 RB E350 5.4L, former passenger van, lightweight homebrew, no roof racks/box