The hybrid max (the powertrain that makes 369 hp & 400 lb-ft) won't be a 30 mpg vehicle It's going to be less than 27 mpg, based on the mpg of the RX500h F-sport performance. You must of missed the part where I said the 2.5L hybrid will be getting 34 mpg (less than the smaller highlander).Always depends on how you value cargo space. The “almost as much” is in cubic feet with second and third rows folded down: Sienna is 101 cubic feet, the GH is 98 cubic feet, the Sequoia is 87. The second gen sequoia, which is an ultimate gear rig, has 120 cubic feet and that all goes completely flat if you want to sleep in there.
Some initial projection is the Grand hybrid will be rated at 34 combined, meaning about 2 mpg less than the standard Highlander. These 4 cyl turbos will start gulping if you mash them at 95 mph constantly or want to tow with them, but then these are big CUVs and the idea is road trip comfort and capacity.
Anyway, this is a lot of room. It’s 6” longer, 2” wider, and 2” taller than a regular Highlander.
The taller body of the Sienna is going to be more friendly to load cargo without breaking your back, due to a lower load height. Not to mention with the 3rd row up,, with that deep well of cargo capacity it has now that the 3rd row isn't in there.
Though Toyota says the 2nd row isn't removable due to the seat mounted airbags, there is a resistor you can plug in to not trigger a fault and does not cost that much. https://bradshacks.com/product/airbag-simulator/ which you then maximize the cargo capacity of the Sienna, an d a flat floor, which the Grand Highlander doesn't have.
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