I need help with mpg. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 01-29-2007, 04:31 AM Thread Starter
 
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I need help with mpg.

Hi everybody I bought 99 f-250 with 125000 miles on it. I put a 4 inch lift with 35 in. tires and 4in. exh. and a super chip programmer. Im getting 10 mpg. What is wrong or is that normal.
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post #2 of 10 (permalink) Old 01-29-2007, 04:38 AM
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automatic? 4:10 gears?

04 Ford F250 4x4 Crew Cab Long Box ZF6 Manual.
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post #3 of 10 (permalink) Old 01-29-2007, 05:13 AM Thread Starter
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Auto, I dont know on gears. How do check.
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post #4 of 10 (permalink) Old 01-29-2007, 05:50 AM
 
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look on the rear diff it will be listed on a tag bolted on the diff cover. they are more than likely 3.73's but maybe not.
mpgs dont sound good, even with 35's. check fuel filter, air filter? just my .02 get rid of the super chips and get a sct or chip from on of our supporting vendors they can make your tunes work with the bigger tires and build way more power. the guys at Elite are great I had to call them about stuff for my buddies pickup and have been very helpful but u cant go wrong with any one on here.

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post #5 of 10 (permalink) Old 01-29-2007, 05:52 AM
 
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BTW welcome to the garage!!!
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post #6 of 10 (permalink) Old 01-29-2007, 07:57 AM
 
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my truck got around that every once in awhile so id clean the k&n change the oil if needed and change the fuel filter put sum lucas in the tank and take it a little easier next tank
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post #7 of 10 (permalink) Old 01-29-2007, 10:29 AM
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Did you calibrate the speedo for the tire change?

Get an open element air intake like a Tymar or AFE II and do what the other guys have suggested.

How about filling out your signature and letting us know more about the truck. CC, 4x4, LB, SRW? All of those things will make a difference.

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post #8 of 10 (permalink) Old 01-29-2007, 07:03 PM
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Quote:
Originally Posted by rrj413
Auto, I dont know on gears. How do check.
Axle code on the Driver's Side Door Sticker

04 Ford F250 4x4 Crew Cab Long Box ZF6 Manual.
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post #9 of 10 (permalink) Old 01-29-2007, 08:22 PM
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Quote:
Originally Posted by rrj413
Hi everybody I bought 99 f-250 with 125000 miles on it. I put a 4 inch lift with 35 in. tires and 4in. exh. and a super chip programmer. Im getting 10 mpg. What is wrong or is that normal.
Just recalibrate the speedo. even with the 4.1 gears you shouldn't get that bad. Is this around town or mostly freeway driving or are you using the overhead display. I am sure you know this but the overhead display is off quite a bit after you chip the truck. It also depends on your driving habits...if you use your foot alot..then it is probably right. I know when I first got my exhaust installed my mileage went to crap since I was gunning it everywhere I went to listen to that turbo...

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post #10 of 10 (permalink) Old 01-30-2007, 05:07 AM Thread Starter
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How do you recalibrate the speedo. I got number off the axle ( s 409 10 5 9f 17)
axle code was c1.
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