I found this performance report from Boston Whaler:https://www.bostonwhaler.com/wp-content ... UTRAGE.pdf
I think it is the same one as posted earlier by Phil, just located at different web URL. In general, I would give the data from these tests the most weight in evaluating how a particular 370 OUTRAGE is performing; the Boston Whaler data probably represents the best performance that the company test drivers could coax from the boat, engines, and propellers, at the time of the test.
Note that air and water temperatures have an influence. For the 350 triple test the air temperature was 90-degrees-F (hot weather for me) and the saltwater temperature was 86-degrees-F (really warm water for me). When making comparisons, the air and water temperatures should be similar. Colder air and colder water will improve performance. Freshwater performance will be lower due to water density change.
For the triple 350 VERADO set-up the propellers are REVOLUTION4 in 19, 20, and 19-pitch. I assume the 20-pitch is on the center engine and the outboard engines have 19-pitch.
The MPG at cruise is reported to peak at 0.99-MPG (that is statute miles per gallon) at 29.4-MPH (again statute miles) with the engine speed 3,500-RPM.
The test was conducted in January 2015. The ENERTIA ECO was just being introduced in 2015. The ENERTIA ECO may not have been available to Boston Whaler when they were testing the 370 OUTRAGE, so the ENERTIA ECO might not have been tested with this rigging.
The tests of other versions of engine power on the 370 OUTRAGE were done in 2011. At that time there was no ENERTIA ECO available, and the REVOLUTION4 was probably the best choice. Perhaps the prior experience using the REVOLUTION4 propellers led to Boston Whaler using them on the 350-HP engines, too.
The REVOLUTION4 propeller diameter is only 14.6-inches, while the ENERTIA ECO will be a 16-inch diameter. The REVOLUTION4 is also available in pitch increments of 0.5-inch. The ENERTIA ECO is only available in one-inch pitch increments, except for an 18.5-inch pitch model.