Milage
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Posting Guru
Joined: Apr 2006
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I just took another 400 mile trip and got 14.2 mpg. (this is about 1/2 mpg better) I havent changed anything since last time. I guess this is just vearition in temp and humidtity. In any case, I'm very pleased. I still have the A/C switch to fix and brand new headers to install when I get back home. If I could break 15, I would be overjoyed. I will keep you all informed.
Cargo Master
Joined: Aug 2004
Posts: 2,899
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From: Lynnwood, WA
At least it shouldn't hurt mpg that much. Even 3 mpg is a lot.
There are areas with mandatory smog testing, and passing those without cat(s) is not trivial. I have the factory cats, yet I can get around 18 mpg.
There are areas with mandatory smog testing, and passing those without cat(s) is not trivial. I have the factory cats, yet I can get around 18 mpg.
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
I've seen people claiming 20+ on FSB, which given the mods (ignition, bassani headers, hi-flow cat) and circumstances (i.e. flat county roads with 50 mph speed limit out in the boonies) is not unbelievable.
I could probably get a bit more if most of my driving weren't in the city, across the cascades with a bunch of tools loaded in the back, and my driveline wouldn't be getting close to 200k. Of course, I don't have wide tires (245/75R16) and only a mere 2.5" lift.
I could probably get a bit more if most of my driving weren't in the city, across the cascades with a bunch of tools loaded in the back, and my driveline wouldn't be getting close to 200k. Of course, I don't have wide tires (245/75R16) and only a mere 2.5" lift.
Last edited by aurgathor; Aug 7, 2006 at 02:19 PM.
Thread Starter
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Posting Guru
Joined: Apr 2006
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I've just put on Summit headers and I didnt get any better milage. Is this everyone else's experince I'm a bit dissapointed. That was just one trip. I will keep track on the next, just to make sure its not a fluke.
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Lead Driver
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From: Gateway to the West
Headers help develope more HP by letting the engine breathe better, they don't necessarily improve your mileage. While under normal driving conditions, the increased HP (more umph, same fuel consumption) should logically translate into slightly better mileage, there are a LOT of other factors contributing to your fuel mileage including, but not limited to, atmospheric conditions, engine tuning, and even condition of the driveline components.
The notion that the catalytic converter reduces fuel mileage is downright silly. It doesn't DO anything to the engine. Its effect is POST combustion cycle. The worst a cat COULD do, IF the internal substrate is broken, is to restrict exhaust flow. But even then a large enough chunk of the substrate would have to come free to block the outlet on the back of the cat itself. Yes there are aftermarket cats that help keep the exhaust moving through but they tend to be larger for the simple fact that the exhaust gases have to be in contact with the substrate long enough for the cat to actually function properly. I might add here that it is a federal crime to remove a functioning catalytic converter from any car or light truck that was originally equipped with one from the factory.
The notion that the catalytic converter reduces fuel mileage is downright silly. It doesn't DO anything to the engine. Its effect is POST combustion cycle. The worst a cat COULD do, IF the internal substrate is broken, is to restrict exhaust flow. But even then a large enough chunk of the substrate would have to come free to block the outlet on the back of the cat itself. Yes there are aftermarket cats that help keep the exhaust moving through but they tend to be larger for the simple fact that the exhaust gases have to be in contact with the substrate long enough for the cat to actually function properly. I might add here that it is a federal crime to remove a functioning catalytic converter from any car or light truck that was originally equipped with one from the factory.
Cargo Master
Joined: Aug 2004
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From: Lynnwood, WA
Originally Posted by fordfan66
aurgathor, what tires are you running?
Senior User
Joined: Sep 2004
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Mpg
I have an 96' FSB with a 5.8l, XLT model. Does anyone know the stock size of the tank and is there a larger replacement tank that bolts in the factory location? If my tank is 26 gal then my mpg calculation would be something like: 320 miles to the tank, 26 gal capacity= 12.3 mpg.
The only real engine mod I have is the K&N drop in cone set up that the single tube connects to the cone where the factory air box used to be. Nothing around the filter to trap cooler air. It was already in the truck when I bought it. Not sure if I am sold on it however.
Like others have said, If I could get 15mpg I would be extremely happy and satisfied with that. I have about $500 or so to play with to try and get there or partially there anyway. Any suggestions?
The only real engine mod I have is the K&N drop in cone set up that the single tube connects to the cone where the factory air box used to be. Nothing around the filter to trap cooler air. It was already in the truck when I bought it. Not sure if I am sold on it however.
Like others have said, If I could get 15mpg I would be extremely happy and satisfied with that. I have about $500 or so to play with to try and get there or partially there anyway. Any suggestions?
Post Fiend
Joined: Mar 2005
Posts: 8,542
Likes: 5
From: Louisiana
I want to say the stock tank size is either 25 or 26 on the new Broncos, and had a optional 32 or 33 gallon tank with a skid plate.
If your signature is the bronco your talking about, then with 35 or so inch tires and 4.88 gears 12 mpg is GOOD!
If your signature is the bronco your talking about, then with 35 or so inch tires and 4.88 gears 12 mpg is GOOD!