In a Mercury performance test, the new 75hp 4S got 8.8 mpg at 3000 RPM, 23 MPH , and still got 7.4 mpg at 4000 RPM, 32.6 MPH. Top speed of 43 MPH. This on a 17 1/2 foot aluminum bass boat with a dry weight of 1100 pounds. Even discounting advertising hyperbole, MPG is probably pretty good on...