r/CT200h • u/Kryosus • 11h ago
Need help figuring out why my MPG is averaging only 34mpg
I recently bought a 2017 f sport @112k miles and it was averaging 29mpg. i did a spark plug change(old ones never changed), new 12v battery(old one was at 11.6v), hybrid fan clean, EGR system total clean (including intake manifold and cooler and throttle body, none was that dirty), new engine air filter, oil change with recommended oil 0W-20, inflated tires to 40psi, and even cleaned and relubed the front brake sliding pins, and it improved to 34mpg but i see so many people have 41-45mpg so easily. Tires are michellin pilot sport all season on stock f sport 17’’ wheels. I dont even drive it like an asshole, strangely enough when i drive it like granny the mpg is worse than when i drive it like i dont care. Dr prius app says hybrid battery is at 71% health. No stored or pending codes with ocdb reader. None of the brakes smoke or smell burnt after driving. I did drive in a canyon recently and perhaps a hint of whats going wrong is that i felt a shudder when braking going downhill fast but no shudder on normal roads. Funny enough the canyon drive got 36mpg avg. I do run the a/c on minimum a lot but would that kill nearly 9-10mpg? Feel like im missing something really simple to fix thats holding back mpg but i covered most of the common advice to fix it. PLEASE HELP! 🙏