My 2015 echo just turned over 60K and the yellow engine light and red electronic throttle came on simultaneously. The engine lost power so I parked it. Not sure where to look or call the tow truck/dealer. I just came off a 7000 mile trip with no problems but noticed the mileage was getting worse-aprox 18-20 mpg highway at 70mph. I keep the servicing per dealer recommendations and with full synthetic. Any ideas.