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Does anyone believe that exhaust leak can cause decrease mpg?

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Old 05-25-2010, 07:07 PM
makita makita is offline
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Does anyone believe that exhaust leak can cause decrease mpg?

I would say from my experience with this 95 F250

When I bought it only 9 mpg with 4.10. When I plug that exhaust leak mpg went 10.50-11 mpg.

But for some reason it keep pop exhaust leak where I patch.


I couldn't justify drive F250 daily due 9 mpg so I upgrade to 3.55 now I get 13 but I was wonder if I get 15 mpg.

I decided to replaced exhaust y pipe where it have hole. It turn to be Half of pipe are broke it leak tons. I haven't test with new y pipe because exhaust stud broke. I let you know in couple weeks when I get mpg.

I talk to several people they don't believe exhaust leak cause terrible mpg.

Can anyone prove it will cause terrible mpg when there are leak exhaust.
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Old 05-25-2010, 08:26 PM
fusion210 fusion210 is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

If there is a leak before an o2 sensor, it can fool the sensor into thinking that you're running lean and then add fuel to compensate. Thus, lower mpg.
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Old 05-25-2010, 08:53 PM
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sidfreak sidfreak is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

In my experience with my Dodge ram 2500, I was getting 15.5 mpg. The muffler went bad and i had a leak before the cat. I didn't fix it right away because I don't drive it much but when i used a whole tank and did the math, it came up just above 14. I have since fixed the leak and replaced a sensor on the cat and am now getting 15.5 again. John
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Old 05-25-2010, 09:51 PM
makita makita is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

It before oxygen sensor.

That why I remove to replaced one. Amazing it 15 years of plow get toll on it.

It was so thin it crack easily.


I hope mpg improve 2-4 mpg with new exhaust y pipe.


And cat converter is serious plugged. I don't see white screen it just full of carbon black.

Fun thing owner told they replaced cat converter 2 times because it commercial plow for 15 years. Why they replaced because they couldn't pass Federal inspector.

It only have 80K miles now with 18K miles on new engine.

I am consider remove cat converter because new one is $450.
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Old 05-26-2010, 06:15 AM
warthog1984 warthog1984 is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

Quote:
Originally Posted by makita View Post

I am consider remove cat converter because new one is $450.
Removing a catalytic converter will send your emissions through the roof & fail any inspections you might need.

Can you clean yours or pick a used one up from a junkyard?
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Old 05-26-2010, 11:35 PM
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

Holy crap.......450$????.......I got the new one for the dodge for 175$. I used the generic version so i had to pick up an adapter and do some work, but it seemed to work just fine. Good luck. John
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Old 05-26-2010, 11:49 PM
makita makita is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

It giant cat converter.

More close to golf club. Weigh about 30 pound. No reason to have another cat converter since it will get plugged again because I use truck for plow so that would waste my money if it was plugged.


My 91 bronco is only $180 for new y pipe with cat. It small cat like size of math book.


Was work and found #2 giant leaks. It was EGR valve's pipe to exhaust manifold were rot it leak so bad.

No wonder it so annoy on highway it sound like motorcycle.
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Old 05-27-2010, 12:23 PM
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skidmark skidmark is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

You must be kidding ?!

In all seriousness, I don't know much about cars, but I learned when I was a kid that if you have a muffler that resembles a block of swiss cheeze, or in my case at te time, no muffler at all, you will not get as much power out of it due to a lack of back pressure.

If I understand this correctly, I think you would lose out on fuel efficiency for the same reason.

Perhaps if you have a torch you could cut a muffler & cat converter off one vehicle at the junk yard and then weld it onto yours ?
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Old 05-27-2010, 01:28 PM
makita makita is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

Ok Why don't you put plow on that Subra you have.

And plow in 50 driveways which you can't do light on gas you need floor on gas to moving. It put much gas and stick to cat converter's screen.


If you check lot plow guys with Ford or GM truck they don't have cat because they get plugged fast. They only make like 50k miles in 7 years. -They only get 4-5 mpg with cat converter when they remove they get 7-8 mpg.
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Old 05-27-2010, 01:38 PM
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skidmark skidmark is offline
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Re: Does anyone believe that exhaust leak can cause decrease mpg?

Sorry, that wasn't meant as an insult or anything.

Put a plow on my Subaru ? Heh heh .. I probably wouldn't get very far .. for that matter I probably would not even be able to see over the plow
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