Root cause of poor gas mileage

Engine treatment. Add it to fuel tank. Good stuff.


Sea Foam Motor Treatment | Oil & Fuel Additive | For Gas & Diesel

 

Some people put it in the oil too. DON'T! If added to the oil, it can knock sludge deposits loose which can then plug coolant ports and wreck parts of your engine.

 

Bad mpg
down to 20
Also engine is constantly on especially after a sharp drive
Just had a Catalyser replacement

 

agree, the car is just plum worn out. not worth a major investment. i hope you didn't spend too much on the battery.

 

Just clean it? Care to DIY? At 190k it’s likely pretty clogged. More info in my signature (bad flywheel).

 

In my signature, a link. If you’re on a phone you need to click avatar to see the signature. Anyway:

Bad Flywheel | PriusChat

 

The AC system kills it for me

 

..

 

Mike, when you mention that you used 6 bottles of Seafoam, was it the type that you pour in the gas? Or was it the cleaner that you spray into the throttle?

 

There are many factors that affect fuel consumption
External factor
Tire pressure
Tyre type
Gasoline selection, whether the label is appropriate
Driving style Driving type (mainly cities, mainly highways, how many trips per trip)
Vehicle load condition (usually a few people in the same group, do you carry heavy objects)
Local temperature Local road conditions (smooth, a lot of slopes, and frequent water accumulation)
Internal factors of the vehicle
Whether the choice of oil is reasonable
What is the status of the air filter
What is the condition of egr cooler and valve
Whether there is deviation in 4 wheel alignment
Whether the wheel bearing is good
Whether the brakes are slightly locked
Whether the high-voltage battery and 12v battery are aging and their performance is degraded
Whether the front oxygen sensor has clogging and performance deterioration factors
Whether the injector is dirty and blocked, causing poor atomization
The spark plug misfires or the ignition energy drops
Whether the electronic thermostat is normal
Whether the transmission oil is aging and viscous
Whether the cylinder pressure is normal (this is unlikely)
Whether the fuel pump and oil pressure regulator are normal (not likely)
Whether the amount of refrigerant in the air-conditioning system is appropriate (air-conditioning is often used)
Whether the data of each sensor is normal (not likely)
Whether the car body guard is deformed to affect the wind resistance
Whether the valve timing system is normal (not likely)
In short, too many factors can affect fuel consumption, and some of them may have obvious effects. If you see here, you may think it is too troublesome to consider so many factors. Please forgive me for being a patient with obsessive-compulsive disorder. I love my car. My purpose is to make me My car is getting better and better. Don't worry, you can do it step by step. You can feel the situation while driving, check and rule out in your free time, and solve them one by one.

 

Did you put in 6 bottles in one tank, or 6 bottles over 6 tanks? Or other? I would like to try this.

As for me, I ran 1 bottle of Seafoam high mileage at half tank, ran until fill up light. No mpg difference yet :/

My Prius V is getting 31 mpg, very far from 44 mpg rated when new.

 

Thank you!