Sudden drop in mpg

Congrats on your retirement. I dont even know what Excel is! And retirement is overrated. I'm going on 10 years... When does the FUN start??? I hope I dont end up like bisco, with ONE MILLION POSTS.

Somebody said that spending so much time on Priuschat is bad for your health. Thats very possible, if a person NEVER gets out of the house for some exercise! Some guys never seem to log off. I at least go for a daily drive. Take the Starship down to the beach. Enjoy some peace.

Back to my Jack Daniel's on the rocks. Great for back pain.

*Warning* I may be "drunk posting."

 

Well, it's an interesting study in psychology. All the MPG charting, logging, and spreadaheets that some people do. I just simply glance at the ODO on the dashboard.

Are you a mathematical savant? Kind of reminds me of Ben Affleck in that movie " The Accountant."
Take care, Enjoy retirement.

 

Anyone from this post still following it?? My 2017 had a sudden drop in mpg too but none of the suggestions y’all made were the problem. I’ve done manual calculations too and yes it’s a dramatic drop (10mpg!). Dealership has been more hassle than help.

 

My biggest changes have occurred with weather changes. I bought it in winter and got mid 50's. Once spring came around it went up to mid 60's. Summer happened and it's back to 50's again. Fall and it was back to 60's. Repeat. The car seems to be like me, it doesn't like it too hot or too cold.

 

I have the same problem as the original poster.

Please I don't want to hear about the normal Winter, tyre pressure and etc because it's none of those.

So my MPG dropped by 20% of the exact same journey of all the exact same variables etc. IE Winter, Typre pressure at 36psi new tyres as well, new filter, new 12V battery.

For the last 5 years after a COSTCO fule run I could get home with over 66mpg. Since a few months ago it start to drop and now the best I could get is 46mpg of exact same journey and exact same variables.

No lights on dash. So what could be the problem? I changed spark plugs as well (btw my Prius is at 57K miles) and cleared the air flow sensor.

I just also checked brake binding and all four wheels are running freely with no obstructions.

Any suggestions? My mechanics are scratching their heads.

 

MPG dropped by over 20% on the same run and same variables | PriusChat