We purchased a 2013 Spark, manual tranny and went from Iowa to Michigan, Wisc. and back to Iowa with absolutely no problems. You have to leave it in neutral, the ignition key turned to accessory. Our Mercedes Pleasure Way class B van handled it wonderfully. You couldn't even tell it was back there. We probably turned it on a couple of times a day when we were fueling it up or eating lunch, whatever. Wasn't a big deal at all. Our Spark got 44.5 mpg on the open road in a couple of side trips, and is a blast to drive. We get a ton of questions about the car from a lot of people. We are very happy with it. We probably averaged 65 mph and had no issues with it.