You will never be able to make it up in fuel savings - complete myth. You are getting very good burn rates, I'm close to Don's.
The new advantages mentioned are also offset by the fact that the new DFI 2 strokes met all the same criteria vs 4S. Not that they are any cheaper mind you but 4/5 mpg is very attainable on both but maintainence and fuel is a wash.
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Any way you measure it - dumbass is expensive
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