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post #1 of 11 Old 07-26-2013, 01:06 PM Thread Starter
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weird mpg problem

If I fill up same pump same station all the time.
If I fill up at 1/4 tank I get 18 MPG
If I fill up at 1/2 or less I get 14 MPG

Both numbers are hand calculated. I have a RR, intake, exhaust, HPX, DP Tunes (80 econo). I can do this over and over and over and get the same results every time. I have drop the tank and put a new pickup tube without the bypass. Pre liminary fuel filter oil and fuel air filters all new.
Anybody have any ideas why the weird mileage.
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post #2 of 11 Old 07-26-2013, 11:34 PM
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Are you waiting for all the foam to settle so you can fill to the edge of the filler every time?

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post #3 of 11 Old 07-27-2013, 03:54 AM Thread Starter
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I fill it several more times after it stops the first time. I usually stop it on an even dollars 102.00 instead of 102.86. I don't know why probably just my OCD acting up.

01 XL, Auto, CC, DRW, 2WD, 217k, 9' utility bed.
DP Infinity & F6, 4" exhaust, stage 2 intake, RR, HPX,
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post #4 of 11 Old 07-27-2013, 08:56 PM
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Try ignoring the dollar amount and filling right to the edge of the filler each time. If you just wait for it to shut off you won't get a consistent reading.

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post #5 of 11 Old 07-28-2013, 12:35 PM
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Try ignoring the dollar amount and filling right to the edge of the filler each time. If you just wait for it to shut off you won't get a consistent reading.
I agree. It takes me a long time to get fuel. I would say 30 minutes at a gas station is not exaggerating! That includes going inside usually though
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post #6 of 11 Old 07-28-2013, 12:40 PM
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You can't use the 1/4, 1/2, 3/4, or F ratings on the gauge to figure MPG. You have to fill up full the same way time after time.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #7 of 11 Old 07-28-2013, 01:23 PM Thread Starter
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I do fill up tge same way. If I am going on a long trip I fill up before I start out in it. Some times it happens to be after 1 or 200 miles. I calculate the mpg just because I can. The 1/4 or 1/2 tank doesn't figure into the equation. It was just a place marker that I noticed.

01 XL, Auto, CC, DRW, 2WD, 217k, 9' utility bed.
DP Infinity & F6, 4" exhaust, stage 2 intake, RR, HPX,
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post #8 of 11 Old 07-28-2013, 01:31 PM
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Then I don't get what you're asking, since you mentioned you MPG is different at 1/4 and 1/2 tank.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
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post #9 of 11 Old 07-28-2013, 01:39 PM Thread Starter
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Miles / gal =MPG right? So if I fill up at 450 miles or 200 miles it should be about tge same MPG?The gallons should be proportional to tge miles.
So my question is what could be the causing the difference?

01 XL, Auto, CC, DRW, 2WD, 217k, 9' utility bed.
DP Infinity & F6, 4" exhaust, stage 2 intake, RR, HPX,
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post #10 of 11 Old 07-28-2013, 01:40 PM
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Oh you mean that if you drive until a half tank or until a quarter tank the math is different. Gotcha.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
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