Gotcha. Terminology was getting me. Rounded for the first 24", total inward dimension 18". It does sound a lot like the Dryden tail.
That's really what's getting me. Yours and the Dryden tail work very well but are quite a bit more aggressive than the template. Just not TOO aggressive apparently.
(And your RV is doubling my latest 9000 mile average. Diesel/gas is in there, but still, DOUBLE for about the same frontal area.)
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