Less mpg with 20” wheels

[Lgman]

so I put 20” wheels on my sedan 4.6 engine and it seems to be using more gas. Is that normal. Also recently changed temperature sensor and thermostat due to other problems.

 

[Jhon]

Could be that your odometer is off because of the new tires and that would make you think your mileage is different.
Just a thought.

 

[Starflyer]

Could be that your odometer is off because of the new tires and that would make you think your mileage is different.
Just a thought.

I believe bigger tires (circumference) certainly would effect the odometer readings.