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Old 08-17-2006, 12:51 AM
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Poor Mileage Help

Hi Everyone
Does anyone know what could maybe wrong with my truck?
I Have '01 psd cc sb 315/75/16 bfg tires 3.73 gears boost,trans,exhaust gauges 5" of lift 4" turbo back exhaust k&n filter (just cleaned) superchip programmer.
The problem is that no matter what I have the chip set at I can only get at best 14 mpg city or hwy and I never going over 70 mph babing it on take offs.The truck seem to run great
Has anyone had this type of problem?
Please Help
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Old 08-17-2006, 01:07 AM
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I think your problem lies in the 315s and 5" lift while running 3.73s myself, but I could be wrong.

Changed the fuel filter lately? Might try running synthetics completely thru the driveline, that picks up 1 MPG or so.
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Old 08-17-2006, 01:45 AM
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same deal here with 3.73s and 35s. guess its the price you pay to look nice. my parents have little 31s and drive without ever hearing the turbo. its sad but they get 18mpg alllll the time.
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Old 08-17-2006, 05:59 AM
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How many RPMs are you running to get this poor milage?
Try running a tank of fuel and don't get it over 60 mph. I get alot better milage if i don't get in a hurry and drive like my grandma. Actually she drove faster than i do....and she couldn't see well!!
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Old 08-17-2006, 10:41 AM
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I do driving like a grandpa that why I think maybe something might be wrong.When I pull a 4500lbs trailer hwy at 70 mph cruise set and all flat ground I'm lucky to 12 mpg. I changed my fuel filter about 2000 miles ago along with the oil. I running about 1850 rpms at 70mph.The truck only 56000 mile on it not broke in?
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Old 08-17-2006, 05:53 PM
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do you have your speedo recalibrated for the new tire size???
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Old 08-17-2006, 11:08 PM
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yes the speedo is recalibrated
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Old 08-17-2006, 11:24 PM
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Yeah I am going with tire size...Sux though huh
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Old 08-18-2006, 11:38 AM
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The funny thing about it is the before I did anything to the truck when it was bone stock I got poor mileage. my mileage has not changed with everything I have done to it.
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Old 08-18-2006, 12:15 PM
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I've ran big meats on a few of my trucks. Between those and the rearends is probably the cause. Your lucky, one Super modified
'74 El Camino(vette 350 and 44" Dick Cepecks) I had, got about 6mpg on a good day!
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