How is it for long, fast road trips?

Per car and driver and motor trend 75mph test nothings and Landcruiser have the same mpg. So the range at those speeds goes to gx. Where gx falls short in mpg is in street driving.
This makes sense, as one is essentially moving the same gross vehicle weight down the road, and with the LC the battery only brings an MPG advantage under city stop/go conditions.
 
There will be a point, I suspect, that both vehicles get within a mpg of one another. Will a GX550 GET 23.5 MPG at 75mph?

At 75mph with a UHAUL 5X8 box I got 15 mpg. Probably only 1000lbs total weight. At 77 if dropped to under 14. I could feel the trailer aero really starting to drag so I backed off. Effortless at 75 in spirt mode but that makes it a bit shift happy. It would actually hold one gear higher better I Normal mode....I think. I was also getting better anticipating the hills like an 18 wheeler....
 
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