Birk01
New member
I have a 2020 chevy trail boss with 40k miles on it. I bought it with 23k so second owner. Anywho I noticed a huge drop in fuel mileage 2 oil changes ago. Was averaging 17 to 18 mpg but now I'm at 10 to 11 mpg. I've switched fuel, where I have purchased fuel, I'm also driving about the same speeds everyday. I haven't done pen and paper yet I was just going off by my monitor/dash screen. Even if it's not right I can tell my fuel mileage has gone down. I do usually put 87 in it but if I was getting the good mileage with it why all of the sudden drop? No codes nothing seems wrong it drives great and throttle response is solid. Any insight would be greatly appreciated!