In the past couple weeks, on my daily commute which is 110 miles each way, my avg mpg has decreased to 32, normal is 39, 37 on a bad day, 41 on a good day (if the wind is at my back).
Checked tire pressure, air filter, plugs were replaced about 7K ago.
Yesterday and today tried looking at the different speeds vs RPM and what the mpg is.
I was getting decent mpg at 55 and below in 6th gear low rpms. At 75 rpms are over 3k and mpg seems to suck at 31 to 32.
So was wondering about the PCV valve and what the symptoms would be if it was bad. I know it can cause bad gas mileage, had that happen in my Ranger, would it get worse at higher rpms, but better at lower rpms because of the pressure being created?
Also looked up the valve online and it looks different than what I am used to. Has anyone changed one yet?
Ive had this car since 2013, and this is the 1st hiccup in my mpg. (Close to 260K on the odometer)
No major maintenance yet just normal items valve clearance adjustments, plugs, belts, oil, filters etc
Meant to throw in also no CEL or codes
2013 CRZ EX 6MT
Last edited by Gambolt; 02-15-2019 at 08:39 AM.