MPG reading lower with a cai then a stock setup

[HawkeyeGT19]

First post! Well i have a 2000 gt coupe N/A. Got a k&n cai off ebay for $100 bucks brand new so im like sure why not. With the stock air box my car was reading 20-21 mpg in the city. After the install its reading 18 mpg in the city now. Pretty sure a cold air should help with mpg so why do you guys think my car is reading the mpg wrong?

 

[Explicit_Spade]

More air + More fuel = Lower MPGs.

 

[HawkeyeGT19]

Tune would probably help down the road after a couple more mods right?

 

[Fivefingerdeathpunch]

maybe your right foot is the key factor here.

 

[HawkeyeGT19]

Lol yea i got on it a bit the first day but for the past 2 days ive been trying to keep it light.