400 miles, more or less. Forget the battery charge when it comes to maximum range - it is not significant as far as distance is concerned and those few EV miles are your insurance policy if you do actually run out of petrol. It's a ten gallon tank and if you don't thrash the car, you'll average 40mpg more or less (on long journeys where EV is not a significant factor) - so 400 miles tops.