2 weeks ago i started my cx5 up as usual in the morning and noticed the engine light was on. i drove the car around for few miles and checked the gas cap to make sure it was tight. I restarted the engine and saw engine light stayed on. I then took the car down to the dealership to have the car checked out. few hrs passed by and dealership called and told me they found 40% ethanol inside my fuel tank ??? the regular 87 that i normally put in contains no more than 10% of ethanol. so, i had no idea how i got that excessive ethanol in my fuel tank. dealership then ran more tests and found 5 parts were needed to fix my car. 2 air sensors, 1 gasket exhaust, 1 exhaust converter, 1 muffler gasket and 2 o2 sensors. i looked up the parts online and their worth over $2000!!! Nevertheless, car is still under warranty and i didnt need to pay a cent. but hot damm.... i'll never find out how the heck i got 40% ethanol in my tank.