I got the 1320 code last friday and got everything checked out two days ago and the guy pulled out each coil and tested it with an ohmmeter and said they were fine and the code could be other various problems. Anyway the tank was filled with chevron premium when the code came up and i just got gas at race track and i drove 284.8 miles /13.307 gallons=21.4 mpg. someone on here said my problem was caused by bad gas but i have never gotten above 19mpg in the 10 months since i have owned the car. So what is going on with my car? Did pulling out the coils maybe reset the ecu or something weird like that?

 

I get ~25mpg in mixed driving...