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My lifetime average with the CAI on my Mustang has been 20.4. My last two full tanks have been with the stock airbox back on and I will do a WAI after I am done with this tank. The two stock airbox tanks were 22.4 and 22.6, (647 miles on 28.722 gallons for 22.5 MPG across these two tanks) in winter, 45/55 city/hw driving.
A comparable tank from last fall/winter was in Oct when I did 19.8 on 40/60 driving. I did a 16.3 last Feb but that was 100% city.
A comparable tank from summer was 20.7 MPG on the 3rd of July with 50/50 driving.
I love that I'm beating a warm weather CAI tank in winter with the stock airbox.
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