Loved my 2014 Spark and decided to trade it in on a 2015 Spark with more features earlier this year. 2 days in to having the car, it was taken in because it wouldn't accelerate when on the highway. The dealership ended up replacing the flywheel. Most of my driving is local and highway (55mph & higher) is usually 20 minutes or less. First extended travel on highway, 30 minutes into the trip, the car decelerated on inclines and would not accelerate in a normal manner that would be considered safe. Took the car to the dealership and they found nothing on diagnostics. Told me to use "Premiu