Fern

??? What do you guys mean. I’m not that stupid to think it’s a 4 cylinder. I changed all six plugs 

Update: all I had to do was disconnect the battery, let it sit 10 min for all settings to reset, than put it back on, I know get 13L per 100 after changing all SIX sparkplugs on my 6 cylinder car.... 

Yea the plugs I used are fine, I rechecked the work I did multiple times I don’t see anything that could be wrong , there are only 4 connectors and they all are on properly , all lines are on properly, after all the work when I went to turn the car on, the gauge still read 18.9 as it did before I changed the plugs so then I tried pressing and holding the button to see if it would reset or re calibrate it , that’s when it started giving me all these whack numbers. 

I recently changed my sparkplugs on the 3.5L 2009 Dodge Journey to get better fuel economy from 18.9l per 100 km but noticed a problem after changing the plugs. At idle the gauge shows I get up to 30l per 100 and keeps going up drastically, when cruising  between 1500 to 2000 rpm it says I get as low as 16 but as soon as I make a stop or idle or go past 2000rpm  it goes up to the 20’s , what did I F**k up now?