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Nice instructable! I always say, anything worth do is worth overdoing!
My thought was to take a more direct approach and use a small 10HP diesel engine driving a single wheel behind the car. Put the whole assembly on a receiver hitch so it can be removed and put on for the 4 highway trips per year that I take. This would eliminate all the inefficiency losses due to running a generator and converting the power in the battery charger. The drive could be direct through a chain with a clutch to engage/disengage the drive once highway speed is reached. The electronics in the car would simply perceive the entire trip as being downhill or with a very strong tailwind!
At 100 Kmph my Nissan Leaf (one of the most aerodynamic cars on the road) draws about 15000 watts of power, that is getting to be a pretty good sized gen set.
As someone who has survived hantavirus (no it is not always fatal) I will support the argument that mice CANNOT be in your living space. Just had a mouse in the house and read your 'ible after finding the peanut butter had been licked clean from the triggers on my traps. Did the tweak you suggested and 1 hr later, no more mouse! Thank you