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The PM article also uses a long-bed Isuzu which has a relatively short cab height and a very long bed.
With all the talk of rotating bubbles helping the air get to the tailgate - I'm sure the height of the cab and the length and height of the bed play a role. On a full-size short-bed truck, topper vs. tonneau vs. aerocap might be totally different than a small, long-bed truck.
PS - I used to own a 1984 Isuzu diesel 2wd longbed (with a square camper top) and consistently got better than 35 MPG. Unfortunately I never did any ABA testing with the topper. I wish someone made a truck today that would get that mileage.
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