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Originally Posted by EVDRVR
My Solectria weights the same all the time.
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Lucky you - I've driven a Solectria Force a few times. Very slick little EV!
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Anyhow, I thought for your records if your not already doing so you might want to record fuel level and other things that might increase or decrease the weight if you want to compare these tests over time.
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I haven't been tracking fuel level during these coastdown tests, mostly because I don't think tests done on different days are directly comparable. I feel only tests done on the same day in the same weather conditions are comparable with the smallest margin of error. EG. temperature changes have a large effect on rolling resistance, and to a lesser extent on drag (as air density changes).
But you're right - the changing mass of the car might show up in the results.
palemelanesian documented an effect on his fuel economy depending on the amount (changing mass) of fuel in his tank. See
http://ecomodder.com/forum/showthrea...html#post27765