Hey. I'm wondering how you are estimating your range. I imagine it is inversely proportional to the mass of the vehicle, directly proportional to the capacity of the batteries, and you'd have to take into account the peukerts effect and rolling resistance... But I can't find a specific equasion. Do you have one, or are you a maths wiz and can figure it out? :P
I thought it'd be a good thing to have up here in this forum, too.