I have now seen the race, and I think they erred on the side of caution. They did not come close to running the batteries down - and if they had, then this would be all anybody talked about. So, they opted to keep the speeds down - though 140MPH is hardly slow!
I think they will change the power mapping rules as the season progresses.
A point they missed making was that each car has just a 28kWh battery, and since the drivers swap cars, they can use up to 56kWh for the race. That means the 25 laps around the 3.44km course put the race distance at 86km / 53.43 miles, and they used less than 56kWh of electricity which is equivalent to just 1.66 gallons of gasoline.
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