Freeway driving

The miEv absolutely sucks so much power on the freeway, a 30 mile trip drained the battery down to about 30% , luckily I was able to charge at destination so making it back was fine, though we took hwy 99 which has lights and a lower speed limit, didn't even use 25% on the way back. Looks like the car will be restricted to city driving and only short transit on the freeway. I can't believe the thing gets about double the mileage on city streets. Good to know.