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How about a metro xfi engine? the insight engine is over 70hp just for the gas engine part of it if I remember correctly, granted part of that is due to the variable valve timing and it being able to rev up, but even the standard metro engine that revs higher then the metro xfi engine is pretty tame and it should have no problem pulling the insight down the highway.
from what I hear the Honda Fit has the same engine mounts and spacing, you might be able to find a 1L honda fit engine, or the 1.2L and have it bolt right in.
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