I've heard that this situation is possible. Remember that the REX has a 2.5 gallon tank and a best case range of 80 miles per fill up though, and that's probably at slower than interstate speeds, so to cover 500 miles, you'd be doing a lot of stopping, say 150 miles on the first tank and battery, and then 60-70 miles with each fill up, making a 500 mile trip at least seven stops, assuming you are driving in congested enough areas that there are gas stations every seventy miles.
This reminds me of when I used to work in Germany and saw Smart For2's in the slow lane of the unlimited stretches of the Autobahn. Sure, you can do it, but do you really want to?
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