ztruk8

I thought the CAI might have been the problem but it has to be now. It is not completely sealed tight in the engine compartment and that must be the problem, i'm going to put the stock intake back in eventually.


I just went on a 450+ mile trip all highway miles at 70mph steady on cruise control and i hand calculated it to be at 16.5 miles per gallon. It should not be this low.

I have 4.6L 2v supercab 6.5 bed.

Wicker

What brand did you buy, and where was it not sealing properly (towards the throttle body, or the air box)? If it is too loose, you may think about going to a local hardware store and purchasing a thicker rubber seal for it... just a thought that might help.

Any pics of where you think it may be leaking from, might help for suggestions.

ztruk8

Down on the sides of the airbox facing the front and side walls, there is a centemeter gap all around.

It's volant.

Thunderslide

when did you take this trip. since it got cold mine is down too.

Wicker

Since there is no leak between the air filter and the throttly body, you shouldn't worry about the gap between the plate and the fender well. I'm not positive, but since this gap occurs before the air can pass through the filter, the only draw back I can think of would be that some of the air is being pulled from inside the engine compartment. If you can't stand that, the only couple suggestions I can think of off the top of my head are:

1. Make the most use out of the extensions off the CAI and see if you can wiggle more length out of the tube to make it flush with the fender well.
2. Use part of the original air intake tube, and see if you can extend the CAI from the throttle body out the cm you need.

I have also noticed that my MPG's have gone down since it got colder. I remember reading somewhere that gas mileage is directly related to the outside temperature (however insignificant it may be). I don't know if this is fact or fable, but may have something to do with what you are experiencing.

skyhawk1

Your CAI may not be your problem. My truck has been stuck on 17.4 to 17.8 all summer, got in the other day and scrolled to the MPG and it said 15.4! I'm blaming it on the cold weather. Longer warm-ups, etc. Not sure if the oil companies put a winter additive in gasoline like they do diesel fuel, but my last truck (2008 Super Duty with 6.4 diesel) the MPGs would drop drastically in the winter.

gone postal

Yes, Virginia, winter blend fuel exists for gassers as well.

Bless the EPA.

Punishher7

During the winter I use my remote start and if is is cold I let it idle at least 10 min before I hop in. It really kills my mileage. Not to mention the winter fuel...

jmrob135

I agree with the winter blend fuel complaints. It may be a combination of the fuel and it not sealing. But the winter fuel sucks.

shoff95

X2 There is absolutely a summer and winter blend.