When I had my twin 115 Suzuki's I tested my performance with one motor. Now this is with stainless 22" props. My best speed with one motor was about 14 knots at 4400 with tabs all the way down. If I dropped down to a 18" I have now doubt speed would have been 25 mph or so at 6k.
Congrats for being a guinea pig. I'm sure MPG at best may be over 4.00.
A homeless guy in Bradenton had some kind of flybridge wellcraft or whatever IO. NO IB motor and he ran a 40hp Yamaha on a home made bracket. I swear he was on plane doing about 15 when I saw him.
All about propping.
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Capt. Brian
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