Hi,
300 km range with a 40 ah pack you won't get, clearly your calculation is wrong somewhere,
there is a nice spreadsheet to help with range and performance calculation, look a this thread:
http://www.diyelectriccar.com/forums...or-172002.html
i've used it and gives realistic figures,
there is another one that was discussed on our forum here, but i forgot it's name,
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