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i remember a 1st gen insight with an electric drive scooter wheel added. it had its own battery pack and controls, it could kick down for really low speed traffic, drive through situations. etc. while the gas engine remained off.
for highway speed, if you are going to idle the big motor anyway, i would just put in a crazy tall overdrive run as low rpm as possible for best mpg, or find a way to run the v8 on just 4 cyl. or less
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