Disappearing fuel mileage

[Dirtymaxx03]

I need some help on ideas as to what is causing my fuel mileage to go to crap. Used to get 17-18-19 mpg's no problem with mixed driving, these days I gotta fight to get 15-16. Truck is not making oil, no rough idle, no white smoke. The only thing wrong with my truck right now is possibly a drive pressure leak due to a hole in the passenger side up pipe. I don't think it's very big because the truck makes boost just fine. Another thing that could have caused it is the fact that I am running without a lift pump. So what say y'all? Could a small exhaust leak kill fuel mileage that bad?

 

[Balindir]

I wouldn't think it would that big of a difference if its like a pin hole... but then again, it certainly isn't going to help your cause...

 

[Dirtymaxx03]

It's a little bigger than a pin hole.

 

[TLyons90]

My opinion is you prob should go ahead replace that uppipe, any air leak isnt gonna be good for any maching in general...

 

[Dirtymaxx03]

Yeah its gonna get repaired along with the hole in my down pipe, i just have to get the motivation to battle the up pipe bolts

 

[TLyons90]

Yeah its gonna get repaired along with the hole in my down pipe, i just have to get the motivation to battle the up pipe bolts

Up pipe bolts are easy! With some leverage... haha

 

[Dirtymaxx03]

I am half tempted to sell the truck instead of messing with those stupid manifold and up pipe bolts. If that tells you how much i hate them

 

[Balindir]

Up pipe bolts are easy! With some leverage... haha

wrench and 3ft pipe! Do yourself a favor and but some anti-seize on them when you put them back in...

 

[bluecollar]

Are you goin off hand calculations or computer.. i know when my cp3 was returning to much fuel i dropped to 3-4 mpg on the dic.. not saying thats the issue

 

[whitelmmmax]

I'm in the same boat minus the hole. My mileage has gone to crap.

 

[Dirtymaxx03]

No fancy computer read out mileage on my truck. All hand calculated. Idk where my fuel has been goin the past couple months but this whole 350-360 miles to a tank is bullshit

 

[blk smoke lb7]

Yeah I have no idea where mine went either ever since the second turbo was installed :roflmao:

Time to sac up and git er done.they arent that bad.

 

[weazel]

No fancy computer read out mileage on my truck. All hand calculated. Idk where my fuel has been goin the past couple months but this whole 350-360 miles to a tank is bullshit

same here... on both of my trucks... starting to feel like the old days running a 454, couldnt pass up a fuel station without having to stop to fill up! :roflmao:

 

[Fastorange]

for the up pipe bolts on the turbo I use this http://www.lowes.com/pd_337328-2232...urrentURL=?Ntt=kobalt%2Bflex%2Bbar&facetInfo=