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Old 10-31-2007, 06:22 AM
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average mpg with large tires

Hey I am a new member and I am just looking for some imformation about mpg. I have a 01 f250 7.3 I currently have 35/12.5 tires and i average between 13 mpg. Is this the normal average for larger tires and is there I could do to get better mpg rather then buying smaller tires? Thanks
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Old 10-31-2007, 06:42 AM
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It just depends on what gear ratio you have chances are you have 3.55 or 3.73 so you will loose a few mpg.
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Old 10-31-2007, 07:06 AM
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Im not to sure on the 7.3 side of things. But I have 315-70-17's and went from 18-20 on the highway to 16.22, just did the math too. so yeah i would say thats about right. Im really thinking about going back to the 265. maybe 285.
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Old 10-31-2007, 07:11 AM
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On a side note.....
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Old 10-31-2007, 07:11 AM
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that sounds about right... but remember if you havnt re calibrated your speedo for the larger tires your MPG will be off... cause your traveling more miles than the speedo says.... im getting around 14MPG with my 37's with stock gears... when i was stock mode i was getting 16-17MPG
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Old 10-31-2007, 07:31 AM
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on the high way i'm getting around 17 mpg.
3.73 gears
had the speedo reset for the tires
runs about 2200 rpm @80
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Old 10-31-2007, 07:35 AM
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i have factory gear in mine I bought the truck less then a year ago the guy just put these tires on and a 3 inch leveling kit. I put a afe intake on and a superchip and havent seen any differents at all really. I am looking for better mpg
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Old 10-31-2007, 09:08 PM
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put an exhaust on if it does not already have it. 13 is probably mostly city driving right? with your set up i would assume 16 or more on straight highway runs. im lifted 10in, 38in tires, and 4.88 gears. getting 11-14mpg depending on how i drive....
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