Gene007

OK guys can anyone tell me why my mileage would drop after installing 4&quot; system from turbo to tail :'( At first I thought well I'm driving different and listening to the great sound but I made a 700 mile R/T to Austin and took it easy, trying to be as gentle as possible. Mileage before new exhaust was 20.7 mpg, ever since 19.0 mpg. IAT sensor is clean. Any Ideas, do I need to reset anything on the fueling system? <br><br>Thanks<br>Gene007<br>WarWagon

Diesel Freak

different side of the FWY? head wind on the way back?

Gene007

The low mpg has stayed the same even when driving the same areas around home. It has dropped. ???<br><br>Gene007<br>WarWagon

Scotty

[quote author=Gene007 link=board=4;threadid=16465;start=0#154601 date=1056874025]<br>The low mpg has stayed the same even when driving the same areas around home. It has dropped. ???<br><br>Gene007<br>WarWagon<br>[/quote]<br><br>Hotter weather and higher humidity can do it.<br>So can a lesser quality batch of fuel.<br>Getting fuel right after they dumped it can do it.<br>Fuel filter might need a change.

Marine

[quote author=Gene007 link=board=4;threadid=16465;start=0#154601 date=1056874025]<br>The low mpg has stayed the same even when driving the same areas around home. It has dropped. ???<br><br>Gene007<br>WarWagon<br>[/quote]<br><br>Mine did as well, but I think I have a heavier foot because I like the sound!<br><br>Mike

Gene007

I tried to compensate for the heavy foot :. The fuel filter is changed every other oil change along with the air filter (change oil every 3000 miles) The truck has over 50k miles on it and has been a constant 20.5 mpg since turning over 10k. Fuel psi is 12-15. As Stated earlier the IAT sensor looks good even though I have not checked with meter. (Might just change it out anyway) Just not sure what has happened, the mileage dropped from the day the Exhaust system was installed (2 months now) ???<br><br>Thanks again,<br>Gene007<br>WarWagon

rattle_rattle

You're only talking about 1.7 mpg difference. Mine varies that much from one fillup to another. Already mentioned wind, temperature, other conditions. I put on a 4&quot; and didn't see any change in mileage.

ProspectorTim

Maybe the mileage drop was a coincidence? <br>Have you checked your intercooler hose-clamps lately? Is it possible that the new system has a more-restrictive muffler? Any defects or blockage in the exhaust pipe? Go back and look at everything you touched during the installation - every wire, hose, sensor, gasket; even anything that you MIGHT have disturbed by accident. Check all the &quot;usual&quot; stuff related to fuel economy, from tire pressure on up. If all else fails, re-install the original exhaust and see what happens. <br><br>Good luck!

AaronT

Gene: I had the same thing happen. Installed 4&quot;, tubo spooled up quicker, runs cooler under load, etc. Could not figure out why mpg dropped. Checked everything and appeared okay. Reset APPS and mpg came back. Don't know if this was conincidental or what.

BigBlue

Mine didn't get affected. ???

KwikKurt

[quote author=Scotty link=board=4;threadid=16465;start=0#154671 date=1056903877]
[quote author=Gene007 link=board=4;threadid=16465;start=0#154601 date=1056874025]
The low mpg has stayed the same even when driving the same areas around home. It has dropped. ???

Gene007
WarWagon
[/quote]


Hotter weather and higher humidity can do it.
So can a lesser quality batch of fuel.
Getting fuel right after they dumped it can do it.
Fuel filter might need a change.
[/quote]

Yeah but did you check the Park Brake????

And what about the old exhaust is it just draggin along under the truck?

Did you remember to unleash the dog from the bumper? ;D

Just trying to help....... What about your sweater? Different color? ???