Ii would love to put an awd axle into my aspire and run a 20hp motor or so. Get the car up to speed, shut off engine or even idle the thing and that would net over 80mpg easy. Scangauges in heavy trucks idling coasting in N say they are getting over 50 mpg over 30 mph. I dont think you'd need all the batteries of a full replacement as you arent using it from a dead stop like OEM hybrids do. Supplementation I think is an angle not many are really considering. Some people with full electric conversions are just charging the batteries and running them down, with no way to recoup power as they drive. You can always just charge your stuff overnight and drain independant of your ICE.
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