Switch the vampire loss estimate to use fixed energy / rated range ratio

The SOC value in the charge_state results is not consistently related to rated
range. Yet all our data show that the car assumes a fixed ratio (but different
for different models). For now I'm adding two such fixed data points which at
least for my data seems to get us more accurate vampire losses.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>