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Discussion Starter #1
hello i just bought a 99 crew cab f 350 wth a 7.3 its getting around 13 miles to the gallon since im new to the diesel world i dont know if this is good or not and also is there any way that wont break the bank to get better milage out of it i dont care about making more power just more milage also as far as i know the truck is all stock except it dont have a muffler or cyt it does have a lift with 305/70r16 on it would love any help i can get thanks

scott
 

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The lift and tires are really killing you. You could regear which may help in town, but the highway mileage would suffer.

You need smaller tires (265) to lessen the rolling resistance and you need it as low to the ground as possible, pretty much the opposite of what you have.

Is the 13 in town or highway? Mine gets 14.5 in town and 16.8-18.5 hwy depending on conditions and how I drive.
 

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mostly in town driving i drove it on the highway one about 60 miles one way thats as far as i have had time to go i dont realy want to regear cause it causes alot of problems with the speedo witch im sure aint right with the tires thats on it anyway thanks for the reply

scott
 

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Yeah, not right for the tires anyway now. I should have thought about that. Have you considered that in your calculations? And are your calcualations by hand?

Given that the tires are 15% larger than stock, the speedo would be off by 15%, and would read LOW meaning you are traveling 15% more miles than your odometer indicates.

given that it would bump your mileage up to 14.95mpg, better than me in town!

You could get a truspeed module to correct the speedo, or have it reprogrammed by Ford.
 

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mileage

My truck only accumulates 6 of the 10 miles i drive! So all of my miles on the odometer have to be multiplied by 140%. The bigger the tires the more off it gets, I even re-geared the thing and the speedo and odometer still can't keep up. Hope that helps.
 
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