I just purchased a 2015 Cadenza with less than 10,000 miles. So far I'm really impressed with the car. I also have a 2002 Ford Ranger (hey, sometimes you need a truck!) which I have found runs great on 100% gas vs the 90% gas/ethanol mixture regulated by the US goobermint. The truck also gets 25% better gas mileage with the pure gas. Question is, would running 100% in my Cadenza cause any negative problems? Early mileage is around 28 as it's mostly highway but just curious if trying the 100% poses any problems. Wondering if it avoids the need for Techtron or Seafoam. Thanks for any feedback.