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Old 08-06-2006, 03:29 PM Fanatic

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I have an 03 f250 with 3.73's and 35's. It's only averaging around 13.9 mpg with a superchip tow safe mode, an afe stage one air intake sytem and mbrp 4" turbo back exhaust installed. I drive it very easy. This last tank got 446 miles on 32 gallons of fuel. This was figured by hand and not taking into acount the oversize tires. How do figure the mpg for the larger tires? What size tires came on this truck stock. I figure if I knew what percentage bigger my 35's are then what came stock I could figure tha actual distance traveled for an accurate mpg. Also what can I do to increase my mpg?

Last edited by tech701; 08-06-2006 at 03:38 PM.
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Old 08-06-2006, 03:59 PM

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the simple answer is to take it to the dealer and have the PCM and ABS module reprogramed to the current tire size.....
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Old 08-11-2006, 03:46 AM
Powerstroke Junkie


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The best way to improve mpg is to ease up on the right foot. Your sweet spot is going to be around 1800-2000 rpms. A difference of 5 mph can easily mean 2mpg difference. If you know anybody with a good tuner you can reset your speedo. A good speed shop or off road shop can also do this for you.
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Old 08-12-2006, 07:38 AM
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I read one place that you can change it yourself with an on off key turns and pushing the od button a few times... but you can only do it like 5 times? Idk... hope you can go from there and maybe find that so you don't have to pay someone to correct it for you.
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