Etec 130 bad fuel consumption

by Reful
(Europa)

Hi, i have boat fisherman 22" weight cca 900 kg with evinrude 130hp etec 2011 year and my max speed is 29 knots on 6000rpm with solas prop rubex ns3 13 3/4 x 13 with 45ltr/hour. On cruising speed on 20 knots on 4500rpm i spend 30 ltr/hour, that is 1.5ltr on 1mile that is too much for me. Something is wrong,maybe that i put new prop with higher diametar cca 14 x 15 x3 blades or 13 1/2 x17 3 blades with more pitch???

On that way i will fall with rpm and i will get cruising speed with less fuel is that tru?

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