How much will the cells cost?
Check out other members posts where they state their power consumption while driving is. After that you can calculate what kind of EV range increase you are getting at what cost. If it makes sense for you, go for it.
If you live where there are lots of hills, does the charge run out before the peak of most hills? If so the you can get a good gain in mpg, if not, in my opinion it would not really be worth it.
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