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Old 04-25-2011
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Achieving 20-22MPG

I am consistently achieving 20-22 mpg since my last mod. I removed the big cat and replaced it with a Y pipe and put a muffler on the truck. So i guess removing that cat free'd something up.

Miles driven 315 mixed city highway
Gallons Pumped 14
315/14= 22.5mpg

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Old 04-25-2011
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No, it didn't free anything up, I get that normally on the highway. I still have my cats.

I just don't drive like an idiot, soft acceleration, don't slam on brakes. That's how you get over 20 mpg
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Old 04-25-2011
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ive never seen anything higher than 14
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Old 04-25-2011
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so did you remove both cats since you put a y pipe in?
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Old 04-25-2011
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so did you remove both cats since you put a y pipe in?
just the big one was taken out and replaced with a Y pipe. the 2 pre cats are still intact
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Old 04-25-2011
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i see 20-22 on the highway. around town i get 17-19. i have no muffler no tuner. 4.10s with 32s. Worst I ever saw was 16 and that was in the winter using 4wd alot.
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Old 04-25-2011
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your cats were probably getting pretty plugged which would increase fuel mileage when they are removed
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Old 04-25-2011
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just the big one was taken out and replaced with a Y pipe. the 2 pre cats are still intact
what did you do with the 02 sensor?
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Old 04-25-2011
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what did you do with the 02 sensor?
there isnt one after it
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Old 04-25-2011
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Old 04-25-2011
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Looks sweet id like to do it but idk if it'll pass ca smog
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Old 04-25-2011
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Looks sweet id like to do it but idk if it'll pass ca smog
probably not it does stink
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Old 04-25-2011
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I need to check out mine. I'm driving very conservatively, 90% highway, and I'm getting only 19 MPG. Since I do a little over 900 miles per week, gaining even 2 MPG would be significant at $3.90/gal.
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Old 04-25-2011
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My 2009 is supposed to get 26 mpg on the highway in 18 in town. With a 19.5 gallon tank I should be able to get 350 miles city driving and 500 miles highway.

The best I've seen so far was all straight highway driving at maybe 22 mpg. Most times I get 14-15. I don't drive like a bat out of hell. I find it amusing that the manufacturers can blatantly lie like that.

Most times I only get 250-260 miles per tank, although it's not right bone dry. I did the math a few times when I filled up and found out I'm getting a whopping 15 mpg.

I don't think anyone here has gotten 26 mpg, have they?
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Old 04-25-2011
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Quote:
Originally Posted by vista4.0 View Post
i see 20-22 on the highway. around town i get 17-19. i have no muffler no tuner. 4.10s with 32s. Worst I ever saw was 16 and that was in the winter using 4wd alot.
I get this, sort of. 16.8 for mostly city driving 4.10's on 32's. 19.3 on my last highway trip. I have NO cats. none up top, or in back. but a muffler at the end.
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Old 04-25-2011
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what size of tires do you run? i get 14-15 but i have 33x1250s.
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Old 04-25-2011
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what size of tires do you run? i get 14-15 but i have 33x1250s.
265s
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Old 04-25-2011
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what size is the y pipe? and what is done with the o2 sensor just unplugged and thats it? do you know if that will cause the cel to come on?
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Old 04-25-2011
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what size is the y pipe? and what is done with the o2 sensor just unplugged and thats it? do you know if that will cause the cel to come on?
there isn't an o2 sensor behind the cat iirc. but if you do unplug it, you can say hello to a check engine light until it gets plugged back in.
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Old 04-25-2011
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Quote:
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there isn't an o2 sensor behind the cat iirc. but if you do unplug it, you can say hello to a check engine light until it gets plugged back in.
only the cats closest to the engine have up and down stream sensors the very last cat the really big one is not monitored. what does IIRC mean
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Old 04-25-2011
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If I Remember Correctly
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Old 04-25-2011
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If I Remember Correctly
yea i figured it was somethig like that
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Old 04-25-2011
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ummm maybe they changed it in 04??? mine has one right after that big cat you are referring too
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Old 04-25-2011
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oh i see now, i didnt even know there was one by the transfer case.
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Old 04-25-2011
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My buddy just straight piped his Civic and he went from high 20s in MPGs to mid 30s. He drives like an A-hole and even more now that it sounds "good". Makes me want to go get a Magnaflow high flow cat and swap it in.
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