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You do not want to use a low Wh/mile number for running range calculations for a EV conversion. You want to calculate for the worst case scenario. That means what is your wh/mile in an ice storm with heat on, headlights on, wipers on driving through slush with snow tires. This will ensure you actually have more capacity than you need 99% of the time. You really don't want to undersize your pack.
For my normal calculations, using a 2000 lb car that gets 35 mpg in normal driving (such as my Paseo) I use 450 Wh/mile. For the Probe I would definitely use more.
More capacity doesn't simply mean more range. It means more longevity of your pack, and you REALLY want your pack to last. If you size it to go 20 miles, in 5 years its not going to go 20 miles anymore. You need to size it to go 25 miles or 30 miles, so 10 years from now it'll still give you 20 miles.
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