mileage
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Freshman User
Joined: Dec 2012
Posts: 34
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From: Central Point, Oregon
mileage
I have a 2003 f-250 s/d 7.3 ltr. 4x4, it is lifted 4" with 20 " pro comp tires and an auto tranny. I am getting between 10 and 11 mpg. whether pulling my 26 ft. trailer or just driving around town. I was told that is not good mpg. Does any one have any idea what I can do to improve the fuel economy or is 10 mpg normal. The rest of the truck is stock. Thank you in advance for your assistance. Bob
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Freshman User
Joined: Dec 2012
Posts: 34
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From: Central Point, Oregon
mpg
M relying on the lie meter. If i go back do I have to lower the truck, or will it be worth going to 18" rims? The rims on the truck were $2000, they were on the truck when I bought it.
Posting Guru
Joined: May 2014
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From: Dustbowl, NV
The first thing I would do is hand calculate a couple of tanks of fuel. Then, you can go about doing something about it, based on a baseline... The tires are going to be a biggie, my 33" tires on 20s dropped my mileage by 3 mpg. But, they look so bitchin' that it's worth it to me!
You can go to 18s or 16s with stock size tires without changing the lift of course. It may look goofy that way, but are you going for mileage or ? Stock height would probably help, too, for less wind resistance.
You can go to 18s or 16s with stock size tires without changing the lift of course. It may look goofy that way, but are you going for mileage or ? Stock height would probably help, too, for less wind resistance.
Cargo Master
Joined: Jan 2015
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From: Boise
I have a 2003 f-250 s/d 7.3 ltr. 4x4, it is lifted 4" with 20 " pro comp tires and an auto tranny. I am getting between 10 and 11 mpg. whether pulling my 26 ft. trailer or just driving around town. I was told that is not good mpg. Does any one have any idea what I can do to improve the fuel economy or is 10 mpg normal. The rest of the truck is stock. Thank you in advance for your assistance. Bob
I have modded many 7.3's for mileage, custom tunes is a must if you are looking for more mpgs.
Last edited by RainDesert; Jan 29, 2015 at 08:57 PM. Reason: grammer
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Freshman User
Joined: Dec 2012
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From: Central Point, Oregon
When I purchased the truck I was told that the truck would be traveling approx. 5 miles faster than the odometer showed..That would make a diff. Tx. Bob
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Freshman User
Joined: Dec 2012
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From: Central Point, Oregon
I would imagine the smaller rims and tires would also make a big difference in the turning radius as well as the mileage. I m not sure I want to do that at the expense of the looks, but, maybe so. Thanks so much for your input. Bob
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5th Wheeling
Joined: Aug 2013
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Ya gotta calculate for the change in tire size fer sure. my 38's are 20% bigger circumference than stock thus adding 20% to the calcs. my 315'S are 10%...all this adds to yer mileage and incorrect speedo reading...10% off will read 50 mph when yer really doing 55...10%. you can easily figure this nowadays because gps's have speedos...compare yer dash with the gps reading for speed and calculate accordingly
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