lost mileage

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01-12-2003, 09:53 AM

6X6

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lost mileage

I have a 99 4x4 3500 with 117000 miles on it when i first<br>bought it i got 21 mpg hwy, 19mpg in town. Now i get<br>about 17.05 hwy the only repairs ever done was a computer<br>reflash. Any ideas as to what could cause this and ideas on<br>how to my mileage back up

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01-12-2003, 02:09 PM

fitzer

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Re:lost mileage

Can't really say for sure, but some guys say their mileage goes to pot after getting a reflash. Might have to get it done again. My 2 cents.

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01-12-2003, 02:49 PM

Shovelhead

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Re:lost mileage

As far South as you are, I'm not sure if "Winter-Blended" diesel is a factor.
But it kills my MPG every winter.
#2 diesel cut with #1 diesel = "Winter-Blend" and is definitaly NOT the combination you need for increased MPG. :

But it's designed to prevent gelling in colder temps.

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01-12-2003, 05:42 PM

rich

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Re:lost mileage

I've had two 6x6 3500 and have never gotten better then 17 out of them. you might need to check your lift pump to make sure it is putting out the right pressure.