My highway fuel economy is only slightly above the EPA rating, but my city fuel economy is much higher than EPA. This is due almost entirely to driving style - DWB, coast in neutral, leave a minute earlier and don't be in a hurry. Drastic weight reduction helps enormously, as well.
If you happen upon a wrecked Prius, then by all means, put its drivetrain to use. But if not, there are far less expensive and less difficult methods that you should use before going hybrid.
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