Ford850

When I have the Instant MPG Bar Graph displayed on my 2013 5.0 dash, the green bar is constantly fluctuating. Obviously it moves as I use more or less gas, but it never settles or rests at a position. It jumps up and down about a quarter inch every second, even while I'm cruising at steady speed. Does anyone else have a graph that does this?

brockbrintnall

Yes. Your truck is constantly fluxuating how much fuel it is giving the motor even if you are on level ground at a cruising speed.

Scarlet

I think of it as a vacuum gauge. I used them on some cars in the past. When I was at cruising speed I used it to get the best mpg I could. Kinda cool.

jcloving

Mine bumps up and down with the AC compressor.