I didn't read all of the first post. I don't think he has the original motor/drivetrain, and is looking for something other than original to replace it with.
But, I agree with everyone, the original Insight 1.0 engine is probably the most fuel efficient option. Second best, might be VX, if it can be made to fit.
Also, if someone wanted to use the ICE without electric assist, getting the computer to control the engine properly might be a challenge.
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