Thinking about it Chevy probably oversized their ICE so it can go 90 mph and zoom up hill and such. It should be just big enough to maintain 65-70mph with any hill climbing, acceleration, or passing coming from the battery. If you over work it, it would need some time parked in the diner lot to the rest area but overall he good for a 500 mile trip with a full charge at the start. Then it still could be all electric for normal commutes.
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