Unplugged and in ECO Mode the monitor said I had 90 mile e-range. Went to pick up my daughter at college 42 miles to the college. The meter said 27 mile e-range when I got there.... Found a Level 2 plug at the college for 30 min. of wait time I picked up 9 e-miles. Then made it another 40 miles to my brother in laws without the range extender going on. The meter said I had 6 e-miles left. I had a 28 mile trip home from there, 26.5 all on Range extender, mostly highway and had no issues. It was not very hot today so no AC. But I was glad to see that the car performed fine in 'REx' mode...