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I am experiencing a loss of power and fuel economy while driving with no codes being delivered. I drive mainly highway miles in Illinois. While driving my 2012 Mazda3I Skyactive will lose power in sixth gear and automatically will shift down to fourth gear all while trying to get to back up to speed. I will shift into fifth and no power to accelerate so back to fourth. I will do this until it holds fifth gear then try to get to sixth, all while fuel economy is sucking gas like a thirsty person on a hot summer day drinking water. Things i have done in order; Replace air filter and have throttle body cleaned, replace original plugs and coils, new battery all while putting injector cleaner in fuel tank ..As random as this happens it randomly goes back to being perfectly fine until it starts again. My last tank of gas got me less than 300 miles. Car has 193,000 miles.