yamaha's 3.3l four strokes are well proven esp the f250, will far outlast an etec....the new 4.2l are a great engine to havnt seen any problems with them either, tons of power and mid range, as far as the 300-250 in the 4.2 crusing fuel economy will b near identical the only difference between the 300 and 250 is a few ecm calibrations and how far the throttle plate opens. for the power id go with the 300 you wouldnt be disapointed!
-mike, master yamaha tech.
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