I have made 7 trips Sacramento to San Diego at speeds of 65-75 over the coastal mountains each time and still was able to maintain a 40-42 mpg average. Each time over the mountain, I did not have to drop my speed to less than 55 mph with moderate passengers/weight.I have taken car for maintenance visits as specified with no problems or failures. The costs for each visit was not unusual. I am highly satisfied with the vehicle and will replace it with another as soon as I can affords same. I have begun saving to replace the battery in case I choose to keep the car.