new intake and exhaust but fuel mileage is worse?? - Ford Powerstroke Diesel Forum
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  #1  
Old 08-08-2007, 09:37 PM
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new intake and exhaust but fuel mileage is worse??

Hey All,

I installed a 4" turbo back Magnaflow exhaust and a Quadzilla intake
even using a CAT delete pipe and a 4" downtube, but I appear to be
getting worse gas mileage now as compared to when I was completely stock.
I am just using the onboard computer to give me the mileage, but shows I am getting around .3 to .5 mpg less than before. I am currently driving the same as before the upgrades, no hot dogging, etc. Thus I am presently at a loss for ideas? The SCT is coming next, thus I know it will help, but assumed I would see at least a little improvement with the current additions.

Thanks in Advance
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Old 08-08-2007, 09:41 PM
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Well, it is very hard to use the overhead to get real calculations. You need to do it with the good ole pen and paper. That is the only true way to get your MPG. I fill up till I see fluid everytime. That way I have the same starting point. It takes a little longer, but it is worth it. I do hand calcultions on every tank. I guess you dont need to, but I found out an injector was going a little by doing it.

Not sure if the increased airflow might have chenged any of the reading the computer was getting. I would just get the SCT and not worry about it.
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Old 08-08-2007, 09:47 PM
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like mentioned above, the only true way to calculate your fuel mileage is to keep track of your miles driven then divide it by the fuel put into your tank. i don't trust onboard computers.
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Old 08-08-2007, 09:51 PM
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Also that is such a small change that could be affected by other variables such as tire pressures and the weather conditions outside if your bucking a head wind one day if maybe you used ULSD fuel instead of LSD fuel. If it was a couple of miles to a gallon then I would be a bit more concerned. Keep checking it by hand for a few more tank fulls and see what your averages are
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Old 08-08-2007, 10:51 PM
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Well, not be the "one" but, I have seen it too many times over too many years.

Almost always when someone puts an exhaust system on a truck they get a little worse mileage for a period of time. It is a subconscious thing that happens and with the changes in exhaust notes you naturally want to hear it more.

Now, I know you said you drive the same but, I bet after a few tank fulls you notice it either gets better or will be slightly better than you were getting.

Just seen it too many times! It is the MAN in us!
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