or you can use black electrical tape and just cover up the numbers

 

My overhead computer is pretty close in stock mode, but it does not see that much anymore. The computer reports 1/2 mpg higher at each power level I load from the Smarty, except it starts at about 2 mpg high on #1.

 

The weird thing on mine is, in the past it was always 2-3 MPG higher than hand calculated. However, every time I fill up, I reset the "lie-o-meter". For the past 4-5 fill ups it has been .2 MPG higher over my hand calculated figure. I'm not sure what happened but .2 MPG is close enough.

 

mine read 1.5 mpg higher every time no matter the program. and like someone else said just change it to the temp and don't worry about it