MPG Increase

[Froggmann]

Things I've done to help fuel economy: U/D crank pulley, E-Fan, synthetic fluids and lower the ride height. Truck averages 20mpg mixed driving, gets 20mpg highway on E-85, and 23-25mpg highway on gasoline. It also handles better and has more power.

 

[hilltopfarm]

straycat - So if I pull my new headers off and put on the o/e exhaust manifolds and y pipe, then I will get the MPG's I used to get? The headers would explain it I guess, since before I replaced the manifolds w/ headers I got 23-24 mpg. Now I get 17-20. The only other thing I did was replace my broken tranny. I thought maybe my MPG decrease could be fuel injectors? I guess it would point more toward the headers. The company that sold them (Pace setter) said that I would get a 10-15% MPG increase. Just a marketing lie...

Thanks

 

[adsm08]

before I replaced the manifolds w/ headers I got 23-24 mpg. Now I get 17-20. The only other thing I did was replace my broken tranny. I thought maybe my MPG decrease could be fuel injectors?

So, you changed something, and things were different, so you pick a part not remotely related to what you changed and said "that's probably what caused it".

That is what I am reading there.

 

[wrecking-crew]

What did you replace that never said you would get better mpg?

 

[hilltopfarm]

adsm08 ~ I am sorry for not stating clearly my situation. My Transmission went out like I said, so to replace that I had to pull my manifolds off. In the process I broke 4 manifold bolts, so I pulled the head off to get them drilled out. My left manifold was cracked, as was the y pipe. I decided to replace them with headers since I read that they would get you better MPG. When I was pulling the head off, I basically took the whole engine apart to get it out and I sprayed everything with B12 Chemtool, in the process I got it on the injectors. I figured that could have messed up the needle/pintle system in them. That is why I thought the fuel injectors could be the issue.

Hope that clarifies my previous statement...

 

[adsm08]

When I was pulling the head off, I basically took the whole engine apart to get it out and I sprayed everything with B12 Chemtool, in the process I got it on the injectors. I figured that could have messed up the needle/pintle system in them. That is why I thought the fuel injectors could be the issue.

Hope that clarifies my previous statement...

Ok, that part makes the whole thing make more sense.