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post #1 of 16 Old 01-13-2008, 12:32 PM Thread Starter
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fuel consumption gauge

I don't know what it's called - but anyways, I just got my 1st diesel, an 02' crew cab, lariat, short bed, single rear wheel. Sweet truck, I love it, and have many plans for it. My question is, I just went through my 1st tank of fuel, and was really glad to see that I was averaging 19 mpg combined city / hwy (by the gauge).
I just filled up again, crunched the #'s, now I'm bummed to find out that I actually only averaged 12.6 mpg
Whats the deal? Is there any way to make this gauge more accurate?
How the hell are you guys getting the 18-22 mpg that I have been reading about? I already plan on an intake / chip / exhaust combo with all the freebie mods that I keep reading about on here, but will that get me 18+ mpg by itself?
And yes, I plan on gauges before any mods.

thanks in advance guys
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post #2 of 16 Old 01-13-2008, 12:46 PM
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can't help you on the dashboard MPG gauge. i know i get 16mpg combined average without much effort.

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post #3 of 16 Old 01-13-2008, 12:54 PM
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I get 18.5 highway 14 -15 city i would like to see 22 never have .Cant help with guage a tech should be around to help..

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post #4 of 16 Old 01-13-2008, 12:57 PM
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that digital radout is not very accurate for some reason, ive seen trucks showing to be geting 27 and 28 mpg, which you know isnt right

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post #5 of 16 Old 01-13-2008, 01:42 PM
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I just do the math. I get 500 miles per tank. 30 gallons in the tank equals out to be about 16-17 mpg. That is everyday average driving. When I get on the highway put the cruise control on. I get about 18 mpg.


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post #6 of 16 Old 01-13-2008, 01:51 PM Thread Starter
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Well, here's what I did, I picked up my truck this past Thursday at the dealer, then immediatly filled it up, and reset the odometer. I drove until I got down to about 1/4 tank, which is generally when I fill up any vehicle. It took 23-1/4 gallons to fill it back up, and I had gone 294 miles since the last fill up.

294 / 23.25 gallons = 12.64 mpg

Could there be something wrong with my truck, what should I be looking at?

What size tank is in these things?
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post #7 of 16 Old 01-13-2008, 02:10 PM
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I believe they rate the tanks at 28 gallon capacity. But you can get 30 gallons in there.
As for having a problem with your truck. Only one way to find out. Put it on a diagnostic computer and do trouble shooting tests.


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post #8 of 16 Old 01-13-2008, 03:35 PM Thread Starter
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I already have, and it threw no codes? Why is my milage so low, as apposed to these other guys? Did I just get a bad one?

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post #9 of 16 Old 01-13-2008, 04:39 PM
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1st is your in a 7.3 so it should be getting decent milage already based on what others are saying .


Your rear end ratio could be higher than a 373 which is the standard rear on a f250 (most common)

Or did you reset the gauge from the previous owner as it kinda works based on how you have been driving and averages . When you reset it it will work off the new #'s
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post #10 of 16 Old 01-13-2008, 05:01 PM Thread Starter
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I don't know what the rear end ratio is, but my truck is a 350, not a 250.
I dont think you can manually reset the gauge, and if you can, I can't figure out how to!

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