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Well, in EV mode the Prius is limited to 34 mph. If you go above that it kicks the engine in and goes through the warmup cycle and you're in hybrid mode again.
As for range, I'm not absolutely sure how far the 4kWh pack will go. I've never tried to deplete it with just city driving. Most people estimate ~250Wh/mile and at 70% dod I would have 2.8 kWh, so that gives us 11.2 miles. That is probably a bit on the conservative side, but roughly accurate. The other range issue is that the dc-dc converter is only putting out ~2kw or 2.6hp continuously. Cruising at 25 mph it will pretty much keep up with you for a long time. However, if you kick it up to 33 mph or so, it simply can't keep up with how much power you're pulling from the OEM pack. About the longest I've been able to go is 5 miles in a 35 mph zone, and that is really putting along and squeezing as much as I can out of it in summer. In winter, no way. In fall I would say I am down ~to 75% of the range. I haven't been using the kit in winter so far since its out for upgrades.
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