'99 7.3 Powerstroke with bully dog gt tuner - Ford Powerstroke Diesel Forum
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Old 05-25-2014, 12:21 PM
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'99 7.3 Powerstroke with bully dog gt tuner

I put a Bully Dog GT tuner in my stock '99, along with an AFE intake and a 4" exhaust in an effort to improve my fuel economy (I was getting 15 - 16.5 mpg). I have not noticed any difference. The first tank of diesel after install was 15.7 mpg. I drive very conservatively and don't put my foot in the throttle. I notice the extra horsepower but no difference in mileage. I am an amateur with the diesel performance parts. Anybody have any insight they could provide? Thanks!
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Old 05-25-2014, 04:35 PM
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Smaller tires, lower the truck, drive like a sissy.

These things will increase your mileage. Performance parts simply will not ever pay for themselves in a mpg return.
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Old 05-25-2014, 05:18 PM
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better mpg

You can clean the evbp sensor or replace it. Also there is a tube that leads to the sensor that needs to be cleaned as well. Some people say use weed eater string. I would be worried about it breaking inside tube. Instead use guitar/piano strings on a drill. Be easy with speed of drill.
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7.3 diesel f350, fuel economy, performace parts

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