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Go Back   Dodge Cummins Diesel Forum > 3rd Gen. Dodge Cummins 03-UP Common Rail Forums > 3rd Gen. Performance Parts Discussion
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3rd Gen. Performance Parts Discussion Discussion of Performance Parts For the 3rd Gen Trucks No Advertising ...NO ADVERTISING

 
       


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Old 05-09-2008, 07:15 PM   #1 (permalink)
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Edge Mileage Max Reports

I guess I'll start this thread dedicated to the Mileage Max. Others that have one post up your results. My first tank was very disappointing. I used the overhead odometer to calculate.

Before mods, all stock I got 16.3 (hand calc'd) on my last tank. City/Highway/Idle

After mods and new 285/70 Michelins I got 14.3 (hand calc'd)!!! Terrible. City/Highway/Idle

Could the new tires have thrown off the overhead odometer that much??? The overhead "lyometer" was higher than normal. 14.3 is just not gonna cut it!!! Are there any other factors that could have contributed to the piss poor mileage???
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Old 05-09-2008, 07:17 PM   #2 (permalink)
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Overhead is always off. Best to do odometer/gal. to fill.
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Old 05-09-2008, 07:23 PM   #3 (permalink)
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Quote:
Originally Posted by BILLS06 View Post
Overhead is always off. Best to do odometer/gal. to fill.
Yeah I did the Overhead odometer/gal to calculate. Is it that far off from the odometer under the speedometer???
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Old 05-09-2008, 07:53 PM   #4 (permalink)
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my overhead ODO matches my dash ODO....I am pretty sure the info is the same. The AVG fuel economy is another matter....
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Old 05-09-2008, 07:58 PM   #5 (permalink)
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my overhead ODO matches my dash ODO....I am pretty sure the info is the same. The AVG fuel economy is another matter....
I knew the Avg Fuel Econ was . I figured the 2 odometers matched. That means my mileage sucks!!!
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Old 05-09-2008, 08:58 PM   #6 (permalink)
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you should factor the tire size change in... try here:

Tire size calculator
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Old 05-09-2008, 09:11 PM   #7 (permalink)
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how many miles are on the truck?
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Old 05-10-2008, 08:20 PM   #8 (permalink)
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Quote:
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how many miles are on the truck?
13,500.......
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Old 05-10-2008, 08:27 PM   #9 (permalink)
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Quote:
Originally Posted by btolenti View Post
you should factor the tire size change in... try here:

Tire size calculator
I used the calculator. It is a 3.5% change. What should I do with this number to get the correct mileage???
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Old 05-10-2008, 08:30 PM   #10 (permalink)
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multiply your miles for that specific tank of gas by 1.035....then divide by the amount of gas you used to fill the tank....
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Old 05-10-2008, 08:39 PM   #11 (permalink)
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Quote:
Originally Posted by btolenti View Post
multiply your miles for that specific tank of gas by 1.035....then divide by the amount of gas you used to fill the tank....
Man that's still bad, 14.8.
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Old 05-10-2008, 09:15 PM   #12 (permalink)
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have you changed the fuel filter recently?

I get about 15mpg around town with some highway. heck....straight highway, the most I can get is 17....
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